The number of wild lions in Africa (非洲) no more than 15,000 in the year 2010. — Like tigers, they are really in danger of dying out, too.

Do you like your Maths teacher?— No, he always makes us _________ a lot of homework.

What a smart and hard-working boy he is!—Right. ________ a possibility that he will win the first place in the competition.

I went to Sanya with my family this summer and all of us _____ a good trip.

Bob used to ________in the countryside . But now he is used to _________in the big city .