完成句子。

1. 因为交通拥挤，今早我又迟到了。

    I was late again this morning ________ ________ the heavy traffic.

2. 经过一天的努力， 他们终于扑灭了森林大火。

    After a day's hard work，they ________ ________ the forest fire at last.

3. 该动身了，飞机一小时后起飞。

    ________ time ________ set off，since the plane will take off in an hour.

4. 休息会吧，我太累了，不能再走了。

    Let's have a rest，I'm ________ tired ________ walk any farther.

5. 如果父母读读自己孩子的微博，就能更好地了解他们的想法。

    ________ parents can read their children's micro blogs, they ________ know their thoughts better .