－The Chinese government is trying to protect the giant panda．

－I know．By 2020, they ________ about 69, 500 square miles of land to the country's nature reserve system．

A．add

B．are adding

C．will add

D．will have added

－Our holiday cost a lot of money．

－Did it? Well, that doesn't matter ________ you enjoyed yourselves．

A．unless

B．as well as

C．as far as

D．as long as

－Did you visit Big Ben in London?

－No．We ________ it, but we spent too much time shopping．

A．could

B．could have visited

C．must have visited

D．can have visited．

－Did you get home a little earlier yesterday?

－No．It was six o'clock ________ we got home．

A．that

B．when

C．before

D．after

－Don't forget to go to the football match tomorrow．

－I ________．

A．don't

B．won't

C．shouldn't

D．mustn't

－I'm driving to Beijing after breakfast．

－Take care,________ with all this fog．

A．mainly

B．especially

C．extremely

D．really

－How about joining me for a cup of coffee?

－________, but I'm exhausted．I was up till 3 this morning , writing a paper．

A．You are welcome

B．Good idea

C．I can't agree more

D．I'd love to

－Can I look at the men for a few more minutes before I decide?

－Of course ________, sin．

A．Make yourself an home

B．Enjoy yourself

C．It doesn't matter

D．Take your time

－He is preparing for the meeting．Shall we ________ a hand to him?

－Had better not．He always lets no one else have a ________ in it．

A．put, hand

B．lend, mind

C．give, foot

D．lend, hand

－Can you read the sign, sir? No smoking allowed in the lift!

－________．

A．Never mind

B．Don't mention it

C．Sure, I don't smoke

D．Pardon me