用所给单词的适当形式完成句子。

1.  Tom's father is    ___  (two) as tall as him.

2.  The oil now is even______(expensive) than before.

3.  She was troubled because she had reached the  ____  (weigh) of 180 pounds.

4.  The______ (high) of the Qomolangma is 8,844 meters.

5. The heavy rain prevented us from   ____   (come) in time.