Qingming Day is also a day ____ people whose parents are dead visit the cemetery.
| A． which | B． then |
| C． that | D． when |
There is little chance ____ the basketball player will recover from his injury in time for the next game.
| A．whether | B．that | C．which | D．how |
. The concert was a great success--there wasn’t a single empty seat in the concert hall, ____ it was very cold.
| A．because | B．when | C．unless | D．although |
The old lady had two clever sons, ____ did a good job in the 2010 National College Entrance Exam, though.
| A．none of them | B．both of whom | C．none of whom | D．neither of whom |
Millions of people watched that first moon landing on television, their hearts in their mouths, aware of how difficult and dangerous an adventure it was, and what risks had to be ____.
| A．taken | B．take | C．to take | D．taking |
. It’s no ____that you can’t find anybody here. They are all away at a meeting at the moment.
| A．question | B．doubt | C．problem | D．wonder |