Which sentence is correct?

Let’s go for a walk, _________we?

Sometimes Mr. Pike has to work very late _______ night to do some important experiments.

Which activities do you think would be difficult ________ blind and deaf people?

He isn’t tall enough ______________ the books on the shelf.

Nam: Did you buy a lot of souvenirs in Hanoi, Nga?

Nga: _______________

We decided ________ at home this afternoon.

I have to ask my father ________ permission to go camping with my classmates.

London is one of the most interesting city I ____________.

My class has ……. pen, ………eraser and two books.

The street is full of traffic from morning___________ night.

The three Rs stands _________ reduce, reuse and recycle.

I don’t have a computer. I wish I...........a new one.

I was very tired, ________ I determined to walk on to the next village.

I can't remember the name of the man _____ I gave the money.

He asked me where I______ the previous day.

At the moment I am spending my weekend go to camping with my friends

The boy found a wallet in the street, and then he ...... to return it to the loser.

This church _____ in 15th century.

We will be there_________ 5 o’clock yesterday.

When he lived in the city, he _________to the theater twice a week.