I want _____ some apples and chicken this afternoon.

They were walking along the shore ________ a huge wave appeared out of nowhere, sweeping them out to sea.[ ]

The number of lung cancer will go down greatly if people 　　　　to give up smoking and do more regular exercise.

Students should be ________ in class.Only listening without taking part in the activities is not good for one’s study.[ ]

Not until all the fish died in the river ______ how serious the pollution was.