His parents both died in the traffic accidents, ________ him a lot of debts.
| A．having left | B．left | C．to leave | D．leaving |
Tom’s English is not good, so he devoted all his free time to __________ it.
| A．studying | B．study | C．studied | D．studies |
Who will be ___________ the company when the manager (经理) is out?
| A．in charge of | B．in the charge of |
| C．take charge of | D．take the charge of |
________ is a very popular sport in summer.
| A．Swim | B．Go to swim | C．Go swimming | D．Swimming |
John failed in the exam, ________he had prepared a lot for it before.
| A．as | B．when | C．once | D．although |
—______ have you studied English?
—For six years.
| A．How long | B．How soon |
| C．How often | D．How far |