When you are in trouble(麻烦), you can _________ help _________ the police.
There was a _____ rain yesterday evening. It rained ________.
There is _____ river at the foot of the mountain(山). _____ river is dangerous.
--- _________are you late for school? ---Never.
—______ English can you speak?—Only a little.
March is _____ month of the year.