Not only ________ about the food, he also refused to pay for it．

A．the customer complained

B．did the customer complain

C．when the customer complained

D．the customer did complain

You had one of your teeth pulled out yesterday, ________?

A．had you

B．hadn’t you

C．did you

D．didn’t you

It is ________ that China will become one of the strongest countries in the future．

A．possibly

B．likely

C．probably

D．lovely

He found it increasingly difficult to read, ________ his eyesight was beginning to fail．

A．and

B．for

C．but

D．or

It was not until she got home ________ Jennifer realized she had lost her keys．

A．when

B．that

C．where

D．before

－Did Linda see the traffic accident?

－No, no sooner ________ than it happened．

A．has she gone

B．she had gone

C．has she gone

D．she has gone

Green products are becoming more and more popular because they are environmentally ________．

A．friendly

B．various

C．common

D．changeable

Start out right away, ________ you’ll miss the first train．

A．and

B．but

C．or

D．while

The secret of his success is that he does everything ________．

A．efficiently

B．curiously

C．anxiously

D．sufficiently

Sugar is not an important element in bread, but flour is ________．

A．unique

B．essential

C．natural

D．adequate