How I regretted ______ the hours in the forest ______ I should have studied hard in the classroom.
| A．to waste; when | B．to waste; where | C．wasting; when | D．wasting; where |
One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
| A．attention | B．commitment | C．reference | D．reaction |
While intelligent people can often _____ the complex, a fool is more likely to complicate the simple.
| A．simplify | B．sacrifice | C．substitute | D．survive |
—Could you help me take care of my pet dog on the weekend?
— I’m afraid I’m not that day.
| A．vacant | B．sufficient | C．convenient | D．Available |
—I began to learn English when I was a little child.
—Wow. You must have studied English for many years, ?
| A．don’t you | B．mustn’t you | C．needn’t you | D．haven’t you |
—Have you got any particular plans for the coming holiday?
—Yes._____, I’m going to visit some homes for the old in the city.
| A．If ever | B．If busy | C．If anything | D．If possible |