We have worked for three hours．Let's ________ a rest．

A．stop having

B．stop to have

C．stopped to have

Our English teacher often ________ us stories in English．

A．tells

B．speaks

C．talks

I don't like ________ of the sweaters．Please show me a third one．

A．any

B．one

C．either

I'm ________ years old．I had a special party on my ________ birthday last Sunday．

A．twelve;twelveth

B．twelve; twelfth

C．twelfth; twelfth

The children all looked ________ at the teacher when he told them the good news．

A．sadly

B．happily

C．happy

It was raining heavily, ________ the soldiers kept on helping people in the earthquake-stricken areas(地震灾区)．

A．but

B．though

C．and

－Thank you very much ________ helping me．

－Not at all．

A．for

B．of

C．to

Nobody can learn English well ________ he works hard on it．

A．if

B．when

C．unless

My partner wants to be an actor．I want to be an actor, too．

A．So I do

B．So am I

C．So do I

You don't have to finish the work today．You can finish it next week．

A．mustn't

B．can't

C．needn't