1. My best...abroad which is impossible...now.

2. Because they are...river, travelling...

3. Although it has...envounter, I still...

4. Because I went...week, I had to...

5. I think...fun, so many...

6. Students can choose between carry out a...issues and conduct...energy.

7. My mother...week but she..yet.

8. Although my bro adult, he still...

XXX.

1.My best is studying abroad which is impossible for us to meet each other now.

2.Because they are going to built a new bridge across this river,travelling will be much more convenient.

3.Although it has been ages since our last envounter,I still remember him clearly.

4.Because I went down with flu last week,I had to postpone my work.

5.I think the festival will be full of fun, so many people will enjoy it.

6.Students can choose between carry out a project on environmental issues and conduct research on the topic of renewable energy.

7.My mother started a business trip last week but she hasn't returned home yet.

8.Although my brother has grown up into an adult, he still enjoys playing with Lego.

XXXI.

2.as long as

3.as soon as

4.When

6.since

9.Although

12.until

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