Great efforts to increase agricultural production must be made if food shortage _____ avoided.

When I jumped into the river, the water ___very cold.

In such a fierce competition, a person has to make every effort if he ______ .

—We are informed that the Weifang International Kite Festival starts at 7:00.  —Oh, I didn’t expect it was so early! I ____ to go out for dinner with my friends first. 

It is reported that China will not buy the Euro debt until some thorough research ______.