15. If the weather had been better, we could have had a picnic. But it ______ all day.

　A. rained　　　　　 B. rains　　　　　 C. has rained　　　 D. is raining

14. Generally speaking, ______ according to the directions, the drug has no side effect.

　A. when taking　　　 B. when taken　　　 C. when to take　　 D. when to be taken

13. What the leader referred to in the report was really something _______.

　A. worthy of considering　　　　　　　　　 B. worth to be considered

　C. worthy to be considered　　　　　　　　 D. worth being considered

12.Though you may hate some customs in other countries, ______ , you must remember “Do in Rome as Rome does”.

　A. likewise　　　　　 B. therefore　　　　　 C. otherwise　　　 D. anyway