21st Century Teens ________ 8 sections, of which I like Fun Time best.

___ universitystudent from America, teaches us ___ history of western art.

There are many sports lovers in his office.Some love climbing, ___ others enjoy fishing

The ordinary house _________ we visited three days ago used to be the house of Victor Hugo, a well-known litterateur(文学家).

emperature ________ so rapidly, wecould not go with the experiment.