These students are quick at learning. We’ll have them __________ with new methods.

Liu Mei wants ____ a doctor when she grows up.

What do you think of haze(雾霾)？ —- It ____ us we all must try to do something to stop the air pollution.

Students should pay attention ____________listening to the teachers in class.

You have more apples than ______ . But mine are better than _______.