People must stop ________ the land, the sea and the air．

A．pollute

B．to pollute

C．polluting

D．polluted

I have to buy a pair of scissors．I prefer ________．

A．the black one

B．black one

C．the black ones

D．black ones

Jeff is a friend of ________．

A．Linda's mother

B．Linda's mother's

C．Linda mother's

D．Lindas'

A large amount of information on health ________ in the computer since last summer．

A．have been stored

B．has been stored

C．is stored

D．are stored

We will start for Hangzhou ________ the morning of July 11．

A．to

B．in

C．at

D．on

The guard kept ________ about the murder in order not to lose his job．

A．quite

B．silent

C．secret

D．worrying

I don't like this pair of trainers．Will you please show me ________?

A．the other pair

B．another pair

C．the other one

D．another one

Dad, what have you cooked for me? How nice it ________!

A．sounds

B．smells

C．tastes

D．looks

There are only ________ days before the summer holidays．

A．little

B．a little

C．few

D．a few

Sarah ________ looking at Kathy's answer．She ________ doing her own work．

A．ought to, should

B．shouldn't be, ought to be

C．oughtn't to, should not be

D．should to be, ought to be