35. I had not been reading for half an hour _____ I heard the steps outside.
A. when B. while C. as D. since
34. ---Call me at 9:00. I can’t afford to miss such a conference.
---Don’t worry. I’ll surely_____ you.
A. remind B. warned C. inform D. remember
33. Try this jacket on; it will be perfect ______ you.
A. in B. on C. by D. for
32. It is _______ he often fails in exams ______ makes his parents worried about him.
A. what; that B. that; what C. that; that D. because ; that