Scientists are convinced ___ the positive effect of laughter ____ physical and mental health．
| A．of; on | B．by; in | C．of; at | D．on; at |
Victor apologized for to inform me of the change in the plan.
| A．his being not able | B．his not being able |
| C．him not to be able | D．him to be not able |
－Good evening, Mr. Green. I’m sorry to bother you. But it’s the fourth of December today.
－Oh, Mrs. Baxter, _______ rent! I’m sorry it’s late. I’ll write you ______ check right now.
| A．the; the | B．a; a | C．a; the | D．the; a |
____ team wins on Saturday will go through to the national championships.
A. No matter what B. No matter which C Whatever D. whichever
－May I have a glass of beer, please?
－Beer? There is _________ left, but you can have some orange juice.
| A．none | B．no one | C．nothing | D．a little |
He was determined not to be the first ______it.
| A．say | B．saying | C．to say | D．says |