— When ______ leaving for Toronto, Canada— We are planning to set out at 10 o'clock.
A. are we
B. will we
C. we will
D. we are
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Don't leave your books near the open fire. They might easily ______.
A. catch to fire
B. catch fire
C. catch up fire
D. catch with fire
100,000 babies ______ born in this hospital every year.
A. are
B. were
C. would be
D. have been
You are welcome to order the goods now. But payment should be made ______.
A. for advance
B. advancing
C. in advance
D. to advance
老年人脑血栓形成最常见的病因是( )
A. 高血压
B. 脑动脉粥样硬化
C. 冠心病
D. 心肌梗死