With all the food supply ___, the researchers had to put an end to the wildlife protection project and returned home.
| A．running out | B．to use up | C．run out of | D．using up |
So quickly ____________ that what is a possibility today may be a reality tomorrow.
| A．is science advancing | B．science is advancing |
| C．will science advance | D．science will advance |
--- Would you care for a cup of coffee?
--- I ________ one. Thank you just the same.
| A．had | B．have had | C．would have | D．will have |
A certain percent of your salary is ________ by the employer as insurance payments.
| A．kept away | B．kept out | C．kept up | D．kept back |
--- Are you in a hurry?
--- No, in fact, I’ve got plenty of time. I _______ wait.
| A．can | B．may | C．must | D．Should |
You can’t appreciate happiness _______ you have known sadness too.
| A．because | B．when | C．though | D．unless |