As students, ______, we should study hard to be well prepared for the future. [ ]

Could you tell me ?–Sorry, I don’t know .I was not at the meeting.

There’s ______ time left. You don’t need to hurry, Jack.—But I want to see her as early as possible.

One is never _____ old _____ learn. [ ]

the team finished most of their research work?—Yes, but the rest rather difficult.