The world today _____ different without the amazing discoveries produced by great scientists.
| A．were | B．had been |
| C．would be | D．would have been |
—Have you got any idea for the summer vacation?
—I don’t mind where we go______there’s sun, sea and beach.
| A．as long as | B．as if | C．now that | D．in order that |
_______is often the case with elder people, my grandma talked about my new hairstyle for at least 30 minutes.
| A．What | B．Which | C．As | D．It |
most parents care about is to provide the best education for their children.
| A．What | B．That | C．How | D．Whether |
--- May I smoke here?
--- If you , choose a seat in the smoking section.
| A．should | B．could | C．must | D．may |
The government has taken measuresair quality.
| A．to improve | B．improved |
| C．being improved | D．to be improved |