( )21. -Mike had ___unusual experience last week. He said he saw___ alien.
-Really Can you believe him
A. a； an B. a； a C. an； an D. an； a
( )22.-The medicine ________ awful. I can’t stand it.
-I know，Jimmy. But it’s helpful for you.
A. tastes B. eats C. drinks D. takes
( )23. ________ Tom ________ Mary speaks good Chinese，so they can communicate with these Chinese students very well.
A. Neither； nor B. Not only； but also C. Both； and D. Either； or
( )24. In the past few years，great changes ________ in my hometown.
A. take place B. took place C. have taken place D. have happened
( )25.-Are your parents strict ________ you，Sam
-Yes. For example，they are serious ________ my grades.
A. in；with B. in；about C. with；of D. with；about