题目内容：

选择括号内恰当的单词或词组填入空白处，使句意完整、正确。

1.— Light pollution is_________(harm/harmful) to our eyes.

— You are right.

2.— How long has she learned English?

—She has learned English _________(for/since) over two years.

3.—In most countries           (nodding/ shaking) the head means agreement.

—That’s right.

4.—You needn’t pay me anything. But please do everything you can       ( help / to help) those in need.

— OK. I will try my best.

5.—Tom, come over and _______(take off / take away) your clothes.

—Sorry, mom. I’m doing my homework now.