Explanation

This sentence belongs to Present Perfect Tense.

We use third form of a verb with this tense.

First form: Spend

Second form: Spent

Third form: Spent

He has spent six years in Lahore means وہ لاہور میں چھ سال گزار چکا ہے

Explanation

Here 'smiles' shows this sentence belongs to Present Indefinite Tense.

Therefore, weeps is the correct answer.

He smiles وہ مسکراتا ہے

He weeps وہ روتا ہے

Explanation

We were annoyed with him.

Annoy is a verb which means ناراض کرنا یا ہونا

Past Indefinite tense

Active Voice= Subject +  Second Form of Verb + Object.

Passive Voice = Object + was/were + third of verb + by + subject.

Explanation

This sentence belongs to Present Continuous Tense.

We use is with he, she, it or singular name.

We use are with they, you, we or plural noun.

We use am with I. 

I am eating a mango.

AGM  5.2.23

Explanation

Good students work hard.

In the given sentence, noun is students.

And it is in plural.

Explanation

 China is the largest producer of vegetables in the world.

After China, India is the second largest producer of vegetables in the world.

Explanation

They is a pronoun here.

Is for singular pronoun.

Are is used with plural noun 

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Explanation

He mocks at me is a tense of present indefinite tense.

Mock + at (fixed preposition)

Mock at means مذاق اڑانا

Present Indefinite Tense

Active Voice: Subject + Verb + Object

Passive Voice: Object + is/am/are+ third form of a verb + by + subject.

Explanation

The verb 'Abide' is followed by the preposition 'By'

Abide by means to  accept or agree.

Explanation

A transitive verb is a verb that accepts one or more objects.

This contrasts with intransitive verbs, which do not have objects.