________ have you been in this city? -- Ever since 2000.
| A．When | B．How long |
| C．How soon | D．How often |
—Have you finished your homework?
—Not _____. There are still some exercises to be done.
| A．already | B．yet | C．just | D．ever |
_____ the environment is important for human beings.
| A．Take care of | B．Taking care of |
| C．Took care of | D．Take the care of |
This is the most beautiful park I have _____ visited.
| A．ever | B．yet | C．never | D．already |
Xi’an is a city with many places of interest and __ tourists come here every year.
| A．thousand of | B．thousand | C．thousands | D．thousands of |
—_____ you _____ your homework yet?
—Yes, I _____ it ten minutes ago.
| A．Did; do; finished | B．Have; done; have finished |
| C．Have; done; finished | D．Will; do; finish |