--Where is Mother?
---She is in the kitchen. She ______ the housework all morning.
| A．is doing | B．was doing | C．has done | D．has been doing |
--- 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 |
We shouldn't have come north for Christmas vacation. If we _______, we wouldn't be stuck in the snow right now.
| A．wasn't | B．didn't | C．hadn't | D．weren't |
The lack of movement caused the player’s muscles to _______ and he might never play the sport again.
| A．hurt | B．ruin | C．weaken | D．threaten |
With the victory at the French Open, Li Na has reached NO．4 in the world, ______ the previous Asian Record.
| A．equaled | B．equaling | C．to have equaled | D．having equaled |