_______ can a tiger weigh, do you know? — Yes, I know that a big one can weigh over 300 kilos.

The twinsin Dalian last year. And theyhere now.

How do you study English for a test? — ______ listening to some tapes. [ ]

We have friends to help us fight against pollution, and trees are one of ________.

My grandfather does well in ______ lanterns ______ oranges.