___ you lose the paper document, sign in www. Sina.com, __ you might download all you need.
A. If, which B. So long as, what C. In case, where D. Even if, as
When you read the book, you’d better make a mark _____ you have any questions.
A. at which B. at where C. the place D. where
The child tiptoed quietly to the bird. ______ into the forest when he was about to catch it.
A. Flew it away B. Away flew it C. Away it flew D. Flew away it
He _______ busy yesterday, or he _______ you with your experiment.
A. was; had helped B. was; would have helped
C. had been; would have helped D. were; would have helped
A teacher of English and class teacher _______ us something about volunteer workers.
A. are telling B. is telling C. are given D. were given
It every day so far this month. I can't tell you if it tomorrow.
A. rained; rains B. is raining; shall rain
C. has been raining; rains D. has rained; will rain