While____the dog,you should take care not to____.Otherwise,it may be dangerous to strangers.

Is there anybody _________ help?—Yes,Lee says he can’t do it separately

. So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.

The second season of A Bite of China ________ for a month. It turns out to be the most popular documentary.

Why was Miss Read so angry with you this morning—She asked me _______.