用expand/extend完成句子。

1. Metals _____   when they are heated.金属遇热则膨胀.

2. Our foreign trade____during recent years.近

  年来我们的对外贸易有所扩大.

3. The petals of many flowers____in the sunshine.

   许多花的花瓣在阳光中绽放.

4. There are no plans to____.

    没有扩建地方机场的计划.

5) It's said that the river____,where almost connects to other country.

    据说这条河延伸到很远的地方,几乎连接了另一个国家.