People in Nome all had diphtheria, a disease that spreads very fast. If ________, it would produce a powerful poison that would kill the patient.
| A．untreating | B．to untreat | C．untreated | D．untreat |
I'll have you ______ English in six months .
| A．speaking | B．speak | C．spoken | D．be able to speak |
I posted the letter some time _____ the week .
| A．in | B．during | C．throughout | D．within |
Take a taxi , _____ you'll miss your train .
| A．and | B．if | C．otherwise | D．or |
If you _____ stop smoking , you can only expect to have a bad cough .
| A．won't | B．would not | C．do not | D．can not |
There must be _____ book which could help .
| A．some | B．any | C．one | D．one useful |