If you meet trouble, you can ______ your friends ________ help.
—______ will you come back from Shanghai? —In one month.
—I went to Daming Lake yesterday. There were ______ people.—Yes. Everyone wants to go out on such a good day.
More and more people find ______ necessary to protect our earth.
My father has ______ for two weeks. I miss him so much.
The listening test usually ______ 20% of the English test.