Jack wasn't saying anything but the teacher smiled at him ____ he had done something very clever.
A as if B in case C while D though
Only after they had discussed the matter for several hours _______a decision.
A they reached B did they reach C they reach D do they reach
Before a problem can be solved, it must be obvious ______ the problem itself is.
A. what B that C which D why
It is the most instructive lecture that ________since I came to this school.
A attended B had attended C am attending D have attended
Do you wake up every morning __________ energetic and ready day?
A feel B to feel C feeling D fell
No one ________ be compared with Yao Ming in playing basketball.
A can B need C must D. might
