1. Accident happened and the ship under construction _______.
A. rose B. attacked C. raised D. sank
2. It is proved _______ China has made great progress in astronomy(天文).
A. when B. because C. that D. if
3. Because of the heavy traffic, he would prefer _______ home rather than _______ home by train.
A. walk；go B. walking；go
C. walk；to go D. to walk；go
