It may not rain, but you had better take an umbrella__________

Look at that girl! Is it Susan–No, it _______ be hers. She has gone backto her hometown.

The world’s population is getting larger and larger,so scientists are trying to ______ new ways to solve the food shortage.

Only when you can find peace in your heart _____good relationships with others.

Whydoyoulooksoworried—MyMacBookProbrokedownandmypaper______unfinishedsince