. It used to be thought _____ the Earth was flat.
| A．as | B．when | C．since | D．that |
My English teacher’s humor was ___make every student burst into laughter.
| A．so as to | B．such as to | C．such that | D．so that |
---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 |