―________ for Beijing?
―Yes. And I’ll come back in three months.
| A．Have you left | B．Are you leaving |
| C．Do you leave | D．Did you leave |
Before her first Harry Potter came out in 1997，J.K.Rowling ________ English for a living in Portugal.
| A．is teaching | B．had taught |
| C．has taught | D．would teach |
—How's your project going，Jack?
—________.I'm half finished with it.
| A．So far so good | B．It's up to you |
| C．Never mind | D．Forget it |
________ an hour every day has made a considerable difference to my health.
| A．Having walked | B．Walk |
| C．Walking | D．Walked |
Not only ________ polluted but also ________ crowded.
| A．is the city；are the streets |
| B．the city is；the streets are |
| C．is the city；the streets are |
| D．the city is；are the streets |
Close the door of fear behind you，and you ________ the door of faith open before you.
| A．saw | B．have seen |
| C．will see | D．are seeing |