七、改错：下列句中各有一个错，请把错处改正。其他部分不得更动。

（本题共 12 分，每小题 1. 5 分。） happened

例：This happening in London.

×××××

1.I asked him more than ten questions, but he did not reply a single one.

  1. That sentence was so hard to understand that I had to have my teacher to explain it for me.

  2. It is interesting to compare the education system here with the United States.

  3. The first two of the five questions on the test paper were very difficult, but the rest was easy.

  4. After finishing his talk, everyone present was invited to tea.

    6.Since travelling across the country might cost as much to

thirty yuan, I suggested that she not plan the trip.

  1. When the enemy were led to believe that there were communists in the village, they started to search them.

  2. It is too lovely a day that I' d like to go swimming.