______ scientists know where a storm will happen, winds will suddenly change, carrying the storm to a new direction.
| A．Even if | B．Since | C．Despite | D．Unless |
---Is Jack on duty today?
---It ________ be him. It's his turn tomorrow.
| A．mustn't | B．won't | C．can't | D．needn't |
—Have you handed in your schoolwork yet?
—Yes, I have. I guess it ______ now.
| A．has graded | B．is graded | C．is being graded | D．is grading |
in the mountains for two weeks, the two bous were finally saved by the local police.
| A．having lost | B．Being lost | C．Losing | D．Lost |
After the long journey, the three of them went back home, ______.
| A．hungry and tiredly | B．hungry and tired |
| C．hungrily and tiredly | D．hungrily and tired |
I’d appreciate ____ if you would like to teach me how to use the computer.
| A．that | B．it | C．this | D．you |