1.He was obviously in some kind of trouble, but I didn't know how I could                  .

他显然遇到了麻烦，但我不知道应怎样帮他。

2.Can you                   the maths problem?

你能帮我算出这道数学题吗？

3.They are trying                   the new medicine to see whether it is appropriate for the skin disease.

4.一句多译

他开始着手粉刷整幢房子，可是只完成了前面的部分。

He                   but finished only the front part.(set out)

He                   but finished only the front part.(set about)

5.I bent over from time                  time to avoid bumping my head against rocks on my left.

6.A good book could                   so completely that for the time being we forget our surroundings.

一本好书能如此完全地吸引我们的注意力，以至于我们暂时忘掉了周围的环境。

7.The writer was                   that he forgot everything outside.

这位作家全神贯注地进行写作，以至于忘了外面的一切。

8．I had created a way to get my message                   while using as few words as possible.

9．After ten years of hard work she finally paid                  her debt.