Many people claim that they have seen UFO with their own eyes, _____ I personally doubt.
| A．when | B．where | C．that | D．which |
He doesn’t like the man, so he will not ______ him to be the president.
| A．ask a favor of | B．do a favor for | C．be in the favor of | D．be in favor of |
Coal was formed out of dead forests by chemical ______ .
| A．produce | B．processes | C．product | D．Progress |
He is trying hard to feed and ____ his family.
| A．home | B．house | C．give house | D．build house |
They say that ____Chinese language is particularly difficult for ____ European.
| A．the; an | B．/; an | C．the; a | D．/; a |
It remains ______ whether he will pass the exam this time.
| A．to see | B．to be seen | C．to be seeing | D．seen |