3.He asked his mother for some money, but she _____ give him.

　 A.didn’t have to　　 B.may not　　 C.wouldn’t　　 D.couldn’t

2. I _____ take the job. No one _____ stop me.

　 A.will; shall　　 B.will; may　　 C.should; will　　 D.shall; may

1.　　　 You _____ get a prize if you win.

A.shall　　 B.need　　 C.must　　　 D.have to

21-25 BDCBA,　 26-30 ABCDB

1．Discovery 2. dilemma 3. mention 4. ranged 5. replacing 6. diseased 7. donated 8. with 9. correspond 10. from 11. meanwhile 12. out 13. spilt 14. 15. in　

1. in detail 2. click into 3. looked into 4. link to 5. in terms of 6. figure out 7. died of 8. to put it another way 9. done with　 10. as a result of

1. correspond 2. specialist 3. recreation 4. Discrimination 5. patent 6. donate 7.rescue 8. handy 9. assist 10. poisonous