______ he referred to in his article was unknown to the general reader.
| A．That | B．What | C．Whether | D．Where |
_______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 |
Thanks to Mr. Smith the father and the son eventually________after ten years' cold relationship between them.
| A．took up | B．made up | C．looked up | D．turned up |