He has a great interest in tennis and ______ it twice a week over the past year.
| A．plays | B．played |
| C．had played | D．has been playing |
There are some health problems that, when ________ in time, can become bigger ones later on.
| A．not treated |
| B．not being treated |
| C．not to be treated |
| D．not having been treated |
In April thousands of holidaymakers remained ________ abroad due to the volcanic ash cloud.
| A．sticking | B．stuck |
| C．to be stuck | D．to have stuck |
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 |
When ________ for his views about his teaching job, Philip said he found it very interesting and rewarding.
| A．asking | B．asked |
| C．having asked | D．to be asked |
Even the best writers sometimes find themselves ________ for words.
| A．lose | B．lost |
| C．to lose | D．having lost |