I don’t know ______ with this problem. It’s too hard.

A. which to do B. when to do

C. what to do D. how to do

The river is too wide for the swimmers _______________.

A .to swim B. to swim in

C. to swim across D. swimming

When I was in the USA,I had difficulty ______ English, so I often ask Paul ____ help.

A. to understand, with B. understanding, for

C. to understand, for D. understanding, with

---How many students have visited the West Lake? ---________.

A. No one B. Nothing

C. None D. Nobody

Mom was cooking ________ Dad was reading newspapers.

A. as B. when

C. while D. since

Li lei’s words made her _______.

A. happily B. angrily

C. crying D. angry

I can______ you my dictionary，but you can______ it for only a week．

A. borrow, return B.1end, borrow

C.1end,keep D.1end, return

There____ a football game on TV this afternoon .

A. will be B. is going to have

C. is going to play D. will play

If there are ______ trees, the air in our city will be _______ cleaner.

A. less, more B. more, more

C. more, much D. much, more

----I feel tired and sleepy. -----Why not stop _______ ?

A. resting B. relaxed

C. to relax D. relaxing