根據句意，用所給單詞的適當形式填空。

I’ve bought a present for my father’s _________(forty)birthday．

根據句意，用所給單詞的適當形式填空。

Tim was seen _________(get)out of the subway at the station on Centre Street．

根據句意，用所給單詞的適當形式填空。

By the time I got outside, the school bus _________(leave)．

根據句意，用所給單詞的適當形式填空。

We do lots of outdoor _________(active)when spring comes．

根據句意，用所給單詞的適當形式填空。

What should we do to help the _________(home)people after the earthquake?

根據句意和所給的首字母提示，補全句子中的單詞。

According to an ancient Chinese legend, the emperor Shen Nong d_________ tea．

根據句意和所給的首字母提示，補全句子中的單詞。

Look, the expression on his face s__________ that something bad must have happened to him．

根據句意和所給的首字母提示，補全句子中的單詞。

The injured people were taken to hospital i_________ after the accident．

根據句意和所給的首字母提示，補全句子中的單詞。

I don’t like eating lemon．It t_________ too sour．

根據句意和所給的首字母提示，補全句子中的單詞。

If there were more trees on the earth, there would be l_________ pollution．