The correct answer is "approves". In first conditional sentences, the if clause uses the present simple tense. The subject manager is third person singular, so the verb must end with s.

The correct answer is "has been". The phrase since 2015 indicates a duration from the past until now, requiring the present perfect continuous tense has been working.

The correct answer is "because". The conjunction because introduces a reason or cause. The manager being sick is the reason the meeting was canceled.

The correct answer is "more". Information is an uncountable noun. More information uses the correct quantifier for uncountable nouns.

The correct answer is "for". The correct preposition after responsible is for. He is responsible for managing the team.

The correct answer is "was completed". The phrase yesterday indicates a past action. The passive voice requires the past participle completed with the past tense of to be was.

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

The correct answer is "will finish". The phrase by next week refers to a future action. The future simple tense is formed with will plus the base form of the verb.

The correct answer is "if". In reported speech for yes no questions, if or whether is used to introduce the reported clause.

The correct answer is "increased". The present perfect tense has plus past participle is used here. Increased is the past participle of increase.

The correct answer is "had spoken". The past perfect tense had plus past participle is used for an action completed before another past action (before the meeting started).

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

The correct answer is "will be reviewed". The word soon indicates a future action in passive voice. The structure is will be plus the past participle reviewed.

The correct answer is "would have met". This is a third conditional sentence: if plus past perfect had prepared, then would have plus past participle.

The correct answer is "who". Who is used as a relative pronoun to refer to people. The employee handles customer complaints is a person.

The correct answer is "be". After the verb insist that, the subjunctive mood is used. The base form be is correct for all persons.

The correct answer is "will have started". By the time we arrive refers to a future time. The future perfect tense will have plus past participle is used for an action that will be completed before that future time.

The correct answer is "are". With neither nor, the verb agrees with the closest subject. Employees is plural, so are is correct.

The correct answer is "reviewing". The verb suggest is followed by a gerund the ing form, not an infinitive.

The correct answer is "than". The word than is used in comparative structures. More effective than shows a comparison between two things.