Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.
| A．have walked | B．will be walking |
| C．have been walking | D．walked |
Although knocked down by a car, he managed to ______ to his feet.
| A．stand | B．rise | C．run | D．struggle |
The sun heats the earth, ___________ is very important to living things.
| A．that | B．what | C．which | D．where |
I will visit you if Father ______ me.
| A．let | B．lets | C．is letting | D．will let |
The policeman warned the drive ________ so carelessly.
| A．never to drive | B．to never drive | C．to not drive | D．doesn’t drive |
—Can I use your laptop for a while?
—; anyhow I am not using it now．
| A．That's OK | B．By all means | C．It doesn't matter | D．Use it |