-Has Tommy finished his homework yet?
-I have no idea； he ____ it this morning.
| A．was doing | B．had been doing | C．has done | D．did |
Time, ______ correctly, is money in the bank.
| A．to use | B．used | C．using | D．use |
After completing and signing it, please return the form to us in the envelope _____.
| A．providing | B．provided | C．having provided | D．provide |
_______ with care, one tin will last for six weeks.
| A．Use | B．Using | C．Used | D．To use |
Film has a much shorter history, especially when such art forms as music and painting.
| A．having compared to | B．comparing to |
| C．compare to | D．compared to |
_____ in a white uniform, he looks more like a cook than a doctor.
| A．Dressed | B．To dress | C．Dressing | D．Having dressed |