21. Although she is only 17 years old, she _________ drugs for two years.
A. Addicts B. has addicted to C. has addicted D. has been addicted to
22. I didn’t go to the party, but I do wish I ____there.
A. was B. were C. had been D. went
23. The plant is dead. I ____ it more water.
A. will give B. would have given C. must give D. should have given