All possible means ______ to protect this kind of animals in danger up to now.
| A．have been tried | B．were tried |
| C．was tried | D．has been completed |
.
You spent 300 yuan on a pair of cotton gloves. Such a pair of cotton gloves___________be worth so much.
| A．mustn't | B．wouldn't | C．can't | D．needn't |
.
With more forests being destroyed, huge quantities of good earth___________ each year.
| A．is washing away | B．are being washed away |
| C．are washing away | D．is being washed away |
.
It is reported that the United States uses___________ energy as the whole Europe.
| A．as twice more | B．twice more as | C．twice much as | D．twice as much |
.
In peace, too，the Red Cross is expected to send help___________ there is human suffering.
| A．whoever | B．wherever | C．whatever | D．however |
.
Mr Smith has bought a new house in the country, around___________some green trees.
| A．which is | B．it is | C．which are | D．them are |