1．When studied in the USA, they traveled a lot． 2．It was in the lab where I picked u

1．When studied in the USA, they traveled a lot．

2．It was in the lab where I picked up the wallet．

3．The bad weather added up to our difficulties．

4．A series of stamps are going to be published next month．

5．They had a face to face conversation．

6．He is interested in politics, so he is quite concerning about the relationships between China and

other countries．

7．So as not to lose the job, he kept silent about the accident．

8．The teacher told the students that they will have a picnic at the weekend．

9．Mother told me that she had bought a new dress for me yesterday．

10．Father asked us not make so much noise．

1．studied改为studying    2．where 改为that    3．去掉up   4．are改为is

5．face to face 改为face-to-face        6．concerning改为concerned

7．so as not to 改为 in order not to     8．will 改为 would

9．yesterday 改为 the day before      10．not 后加 to