Explanation

The verb "began" is the correct past tense form of "begin."

It is sed to describe an action that started in the past.

Explanation

This is a sentence of Present Indefinite Tense.

We use first form (come) in simple sentences of Present Simple Tense.

They always Come back home late. 

Explanation

The subject of the sentence is "spectacles", which is a plural noun.

The verb "are" is the correct form to use with a plural subject. "Spectacles" refers to two glasses, one for each eye, so it's a plural noun.

Explanation

The sentence refers to the past ("last month").

So the correct verb is "was," which agrees with the singular subject "price.

Explanation

Intransitive verbs do not take a direct object, so they cannot be converted into passive voice.