Ladies and gentlemen, please fasten your seat belts．The plane ________．
| A．takes off | B．is taking off | C．has taken off | D．took off |
Mother insisted that the child's hands ______ before dinner.
| A．should wash | B．be washed |
| C．had been washed | D．would be washed |
Plants grow well ______ there is plenty of water and sunshine.
| A．which | B．in which | C．that | D．where |
—Did you write to Grace last summer?
—No, but I'll ______ her over Christmas vacation.
| A．be seen | B．have seen | C．be seeing | D．to see |
In summer people usually stay up late outside, ______ the cool air.
| A．enjoy | B．enjoying | C．to enjoy | D．enjoyed |
The foreiger knows little about ______ is called "Hope Project" in China.
| A．what | B．that | C．which | D．it |