21. There is _______ pollution in the world. We must stop it.
A. much too B. too many C. many too D. too much
22. Hold on your dreams, ________ one day they may come true.
A. and B. but C. so D. or
23. ---Would you like to have _______ ---No, thank you. I’ve had enough.
A. anything more B. something more
C. more anything D. more something
24.There are many kinds of bikes here. She can’t decide _________.
A. where to buy B. which to buy C. how to go there D. when to go there
25. Though he has studied _______ at English for ten months, he can still _______ speak the language.
A. hard； hard B. hardly； hardly C. hard； hardly D. hardly； hard