Every possible means ________ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
I am fond of my sister but she has one serious shortcoming. She _________ be really stubborn.
| A．can | B．may | C．must | D．shall |
The two economic reports were delivered by our president at the board last Monday and ______was very instructive
| A．either | B．all | C．none | D．neither |
Spring Festival is the most important festival in China and an occasion ____ all family members get together, just like Christmas in the West.
| A．where | B．when | C．that | D．which |
His increasing financial difficulties made him so ____ for a job that he would have done anything.
| A．optimistic | B．hopeful | C．active | D．desperate |
Lin Shuhao has followed a markedly different path to ____ of the giant Yao Ming, who was the overall first draft pick in 2002.
| A．which | B．that | C．it | D．one |