At the computer operation test, one is supposed to stay at his own machine, keep his eyes on his screen, _______ to anyone.
| A．and not to speak | B．but could not speak |
| C．instead of speaking | D．or rather speak |
Thanks to my teacher's valuable help, otherwise I ________ my college entrance exam.
| A．can't pass | B．hadn't passed |
| C．would not have passed | D．have not passed |
Oh, I'm not feeling well in the stomach. I ________ so much fried chicken just now.
| A．shouldn't eat | B．mustn't have eaten |
| C．mustn't eat | D．shouldn't have eaten |
She often shares her deepest thoughts and fears with friends through QQ, as if they ________ chatting in her living room.
| A．were | B．are |
| C．had been | D．has been |
—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?
—________ my students have a try?
| A．May | B．Must |
| C．Will | D．Shall |
I ________ him in time, otherwise he would have fallen off the bike.
| A．had supported | B．supported |
| C．have supported | D．support |