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
When the teacher ______ how to do the experiment, the bell rang.
A. explains B. will explain C. was explaining D. is explaining
