He helps them by giving them some food(对划线部分提问) ______ ______he________them?

He helps them by giving them some food(对划线部分提问) ______ ______he________them?

题目
He helps them by giving them some food(对划线部分提问) ______ ______he________them?
You mustn‘t sing in the classroom。改为祈使句
____ _____in the classroom.
Trees can clean the air.同义句转换
Trees can _____the air______.
答案
How does; help
Don't sing
make; clean
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