16. —Have a nice day to you. —________
A. Well done B. Thank you. C. My pleasure D. Me, too
17. -----How many times have you been to China? ---In fact, it is the first time that I __________ here.
A. was B. am C. had been D. have been
18. Do what you think right; Never ______ what others say.
A. care for B. care of C. take care of D. care about
