The road is covered with snow. I can’t understand ________ they insist on going by motor-bike.
| A．why | B．whether | C．when | D．how |
________ he can work abroad next year will depend on his parents' will.
| A．That | B．When |
| C．What | D．Whether |
The new CRH train between Beijing and Shanghai ________ speed can reach about 380km/h will benefit ________ takes it.
| A．whose; whoever | B．which; whichever |
| C．whose; who | D．where; whoever |
The companies are working together to create ________ they hope will be the best means of transport in the 21st century.
| A．which | B．that |
| C．what | D．who |
What some people don't realize is ________ difficult life can be after they get addicted to drugs.
| A．that | B．how |
| C．why | D．what |
Don't put off till tomorrow ________ you should do today!
| A．what | B．when |
| C．that | D．which |