16. He missed ______ gold in the high jump, but will get ______ second chance in the long jump.
A. the; the B. 不填; a C. the; a D. a; 不填
17. – What do you think we can do for our aged parents?
– You ______ do anything except to be with them and be yourself.
A. don’t have to B. ought to C. mustn’t D. can’t
18. John thinks it won’t be long ______ he is ready for his new job.
A. when B. after C. before D. since
