高一英语练习题帮助

1.The runner fell behind the others though he did what he could。

The runner （ ）to keep up with the others though he（ ）（ ）（ ）。【句型转换】

2.Look！there is much rubbish f---------on the lake。

3.Infifity years，maybe our earth will be more c--------with the increasing population。

4.It is as （ ）【有意义的】to donate 1 yuan as10000 yuan。

5.We all know （ ）【污染的】air doesharmto our health。

1.failed tried /did his best

2.floating

3.crowded

4.significant

5.polluted

1.fail

2.floating

3.crowed

4.meaningful

5.pollute

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