________is no doubt that today greenhouse gases are the largest human influence on global climate.
| A．It | B．There | C．This | D．That |
—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 |
Kathy______ a lot of Spanish by playing with the native boys and girls.
| A．picked up | B．took up | C．made up | D．turned up |