Question Detail

they play cricket.

Cricket was played by them
Cricket are played by them.
Cricket is played by they.
Cricket is play by them.
Cricket is played by them.

Answer: Option E

1. His behaviour surprised me.

I was surprised for his behaviour.
I was surprised at his behaviour.
I was surprised with his behaviour.
I was surprised on his behaviour.

Answer: Option B

Explanation:

Note: We use "at" preposition with word "surprised"

2. You sing songs.

songs are sung by you.
song are sang by you.
songs was sung by you.
songs is sung by you.
songs are sing by you.

Answer: Option A

3. It is time to do our business.

It is time for our business to be done.
It is time to our business to be done.
It is time our business to be done.
It is time for our business be done.

Answer: Option A

Explanation:

Note: Please note the use of "for"

4. Please keep quiet.

You are told for keep quiet.
You are requested to keep quiet.
You are requested for keep quiet.
You are told to keep quiet.

Answer: Option B

5. We must have obeyed our teachers.

Our teachers might have obeyed.
Our teachers might have been obeyed.
Our teachers must have been obeyed.
Our teachers must have obeyed.

Answer: Option C

Explanation:

If we have "Subject + Modal Auxiliary verb + have + third verb + object"
then we change it to

Passive subject + Modal Auxiliary verb + have been + third form + by + passive object.

Modal Auxiliary verb are : can, could, shall, will, may, might, should, would, must, ought to etc.