12.---It must be John who is in the office.
---I'm sure it __________ be John.He left the building a quarter ago.( )
---I'm sure it __________ be John.He left the building a quarter ago.( )
| A. | won't | B. | mustn't | C. | can't | D. | needn't |
11.The river is for them .( )
| A. | wide enough; to swim across it | B. | enough wide; swim across it | ||
| C. | wide enough; to swim across | D. | enough wide; swimming across |
10.One of the twin brothers is training __________ the sports meeting,however,the other is training __________ a doctor.( )
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| A. | for; as | B. | as; for | C. | for; for | D. | as; as |