B - A

D - C

C - C

I have never been to Nam Du island before

1/ Unless you work hard, you would not pass your coming exam.
2/ James Watt was a Scottish Scientist who invented the steam engine.

He not only runs fast but also drives carefully.

C - B - A - C - D

C -> ON

D -> BECAUSE OF

B -> WILL BE

C -> WHICH

D ->  OTHER

His car will be repainted next week

It was such a boring film that those boys fell asleep

He asked who put salt in his cup of coffee

I wish I were in the primany school

Phu Quoc Island is more exciting than Con Dao Island

1. compulsory 
2. age
3. exactly
4. windy
5. improve
6. strengths.

C

1. having not ⇒ not having