---Mr Ding,I have some trouble ______the passage!
----Remember _____it three or four times at least !
A,to understand ,reading B.understanding ,reading
C.understanding ,to read D.to understand ,to read
There are so many kinds of pens in the shop ,I can’t decide ______.
A.when to buy B.where to buy C.what to buy D.which to buy
The young man used to _____to work, but he is used to ______to work now.
A.drive, walking. B.drove, walked. C.drive, walks. D.driving, walk
---Please turn off the light.
---OK, Mom. I won’t leave the room ______ the light _____.
A.when; on B.with; on C.with; off D.when; off
--- He went to see the man who was in hospital yesterday. --- ____________.
A.So did we B.So we did C.We did so D.Did so we
_ he tried many times, he still couldn’t move the heavy box.
A.So that B.First ofall C.Even though D.In the end