3. A. Or B. But C. However D. Therefore
2. A. because B. why C. how D. when
1. A. different B. difference C. secret D. results
10.( ) A. it B. them C. us D. that
9.( ) A. Hardly B. May be C. Perhaps D. Nearly
8.( ) A. by B. in C. use D. drive
7.( ) A. safer B. more dangerous C. much dangerous D. safe
6.( ) A. the number of' B. a number of C. this kind of D. all kinds of
5.( ) A. lucky B. glad C. sorry D. tired
4.( ) A. worm B. countries C. land D. earth