To his surprise, Jack found his son ______ as Santa Claus on Christmas Eve.
| A．dressed | B．dressing | C．to dress | D．being dressed |
Mr. Smith，________of the ________speech, started to read a novel．
| A．tired；boring | B．tiring；bored | C．tired；bored | D．tiring；boring |
The boy failed four times, but he said he would try ___________.
| A．a five time | B．a fifth time | C．the five time | D．the fifth time |
Recently there have been many occasions____ you have attended events on your own.
| A．where | B．which | C．when | D．why |
My brother likes eating very much but he isn't very _____ about the food he eats.
| A．special | B．peculiar | C．particular | D．unusual |
Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |