The correct verb form for third person singular in the present tense is "goes".

The present continuous tense requires the verb ending in "-ing".

The article "an" is used before words beginning with a vowel sound.

The sentence refers to the past, so the correct verb is "watched".

The comparative form of "interesting" is "more interesting".

After the modal verb "can", the base form of the verb is used.

The correct preposition for position below a table is "under".

In the first conditional, the main clause uses "will" plus the base verb.

The preposition "since" is used with a specific point in time.

"Many" is used with countable plural nouns such as apples.

The adjective "interested" is followed by the preposition "in".

The future perfect tense uses "will have" plus the past participle.

The correct answer is "Submit". The verb submit means to hand in or turn in an assignment for evaluation.

The correct answer is "Take". The natural collocation is take part, meaning to participate or be involved in an activity.

The correct answer is "Experiment". A scientific experiment is conducted to test a hypothesis.

The correct answer is "Pay". The natural collocation is pay attention, meaning to focus and listen carefully.

The correct answer is "Introduce". Introduce new technology means to bring it into use for the first time.

The correct answer is "Do". The natural collocation is do exercise, meaning to engage in physical activity.

The correct answer is "Collect". Collect accurate data means to gather information systematically.

The correct answer is "Valuable". Valuable information means extremely useful or important information.

The correct answer is "Expand". Expand vocabulary means to increase the range of words one knows.

The correct answer is "Complete". Complete the missing words means to fill in the blanks.

The correct answer is "Meet". Meet deadlines means to finish work by the required time.

The correct answer is "Develop". Develop solutions means to create or devise ways to solve problems.

The correct answer is "went". The sentence describes a completed action in the past yesterday, so the past tense went is correct.

The correct answer is "finished". The present perfect tense have plus past participle is used here. Finished is the past participle of finish.

The correct answer is "reading". The word now indicates an action happening at the present moment, so the present continuous tense is correct.

The correct answer is "were having". The past continuous is used for an action that was in progress when another action the phone rang interrupted it.

The correct answer is "were". In second conditional sentences expressing unreal situations, were is used for all persons with if.

The correct answer is "since". Since is used with a specific point in time 2015, not a duration.

The correct answer is "seeing". Look forward to is followed by a gerund the ing form of the verb.

The correct answer is "went". The phrase last year indicates a completed past action, so the past tense went is correct.

The correct answer is "are". The word now indicates an action happening at the present moment, and the subject they is plural, so are is correct.

The correct answer is "has". The subject she is third person singular, so the auxiliary verb has is correct for the present perfect tense.

The correct answer is "are going". The word tomorrow indicates a future plan, and are going to go is shortened to are going in informal English.

The correct answer is "will". This is a first conditional sentence if plus present simple, then will plus base verb.

The correct answer is "lost". The word yesterday indicates a completed past action, so the past tense lost is correct.

The correct answer is "have". The subject I takes have, not has, for the present perfect tense.

The correct answer is "has". The present perfect with already uses has for third person singular subject he.

The correct answer is "were watching". The past continuous is used for an action that was in progress when another action when I arrived occurred.

The correct answer is "would". This is a second conditional sentence if plus past simple, then would plus base verb.

The correct answer is "listening to". The verb enjoy is followed by a gerund, and listen requires the preposition to.

The correct answer is "have". The subject we takes have for the present perfect tense with already.

The correct answer is "goes". The phrase every day indicates a habitual action, and the subject he is third person singular, so goes is correct.