No sooner ______ on board the train than it started to move.
| A．did he go | B．he went | C．had he gone | D．he had gone |
We now live in ____ is called the Information Age.
| A．when | B．which | C．what | D．that |
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 |