请英语高手看几道单选,求答案及解释,多谢!
33、When ______ this machine, you must read the instructions first.（1分）
A、use B、using
C、to use D、having used

34、That paper must be handed in by next week, so make sure ______ to the deadline.（1分）
A、keeping B、for keeping
C、you keep D、your keeping

35、______ from the hill top, the lake scenery is beyond description.（1分）
A、To see B、Seeing
C、Seen D、To be seen

36、I am wondering ______ for Chinese people these days.（1分）
A、what the dragon means B、what does the dragon mean
C、how the dragon means D、how does the dragon mean

37、The theory of continental drift can ______ the occurrence of earthquakes.（1分）
A、clear up B、make clear
C、make use of D、give an account for

38、Many colleagues came to help me; otherwise I ______ so much work in such a short time yesterday.（1分）
A、would not handle B、will not have handled
C、could not handle D、could not have handled


40、I donˊt ______ that as a serious mistake.（1分）
A、recommend B、regard
C、receive D、suggest

41、他并不是因为想赚钱才那样去做的.（3分）
A、He didn’t do it because he didn’t want to make money. B、He did it because he wanted to make money.
C、He didn’t do it because he wanted to make money. D、He did it because he didn’t want to make money.