题目内容：

 

1.It’s polite of you        (thank) others for their help and support.

2. In order to join Oxfam Trailwalker, they         (train) themselves two months ago.

3. I         (design) the home page for my class when my friend called me last night.

4.Amy’s father        (be) away for three months. He will be back in a week.

5.We are confident that the environment         (improve) with our efforts in the future.