6.It was three months since he came to our school .

5.Tom had gone out as soon as his mother got home .

4.He was very foolish that he didn't pass such an easy exam .

3.He won't go out until his mother will come .

2.Since her husband had died , so she had to support　 her family .

1. The children were running on the playground as fast as they can .

10. She sang ______ she went along .

答案： 1.since 2.unless 3.because 4.where 5.after 6.than 7.as if　 8.so that　 9.before 10.as

9. Do not leave the room _____ you have finished the test .

8.He is explaining clearly _______ they could understand .

7. He　 speaks English ______ he were an Englishman .