Of one thing I am certain _____ hard work contributes to good results.
| A．as | B．what | C．which | D．that |
Have you heard news? The price of petrol is going up again！
| A．the, the | B．不填，the |
| C．the, 不填 | D．不填，不填 |
John promised his doctor he ________ not smoke, and he has smoked ever since.
| A．might | B．should |
| C．could | D．would. |
Michael __________ here to see you and he____________ a note on your desk.
| A．has come; had left | B．has been; has left |
| C．has come; left | D．has been; left |
—Grace, when shall we take a walk?
—After I finish________ the dishes.
| A．wash | B．washing |
| C．washed | D．to wash |
I really wonder__________ he has posted me many parcels_________ we didn't work together.
| A．how ,after | B．why, when |
| C．when, before | D．why, since |