--__________is your backpack? -- It’s red and yellow．
| A．What | B．Where | C．What color | D．Why |
Actions ______ be taken to stop H7N9 from spreading again.
| A．must | B．may | C．can’t | D．needn’t |
She won’t lose weight______ she keeps a diet and takes exercise every day.
| A．unless | B．if | C．because | D．since |
The little boy denied ______ the window with a stone.
| A．break | B．broke | C．to break | D．breaking |
My mother didn’t expect ______ such a lovely present from me!
| A．receive | B．received | C．to receive | D．receiving |
The Trojan War ______ by Helen and her beauty.
| A．causes | B．is caused | C．caused | D．was caused |