There will be _____ people and ____ pollution in the future .

The more _____ you listen to the tape, the _____you’ll find it to understand. —I agree with you.[ ]

Is Mary ? —No, she is a girl.

How do you improve your writing skills?—______ keeping a diary every day.[ ]

Wedon’thavetogofarifweneedhelp _________ ourhomework.[ ]