Don't forget________ the doors when you leave your car in the parking lot.
A. locking
B. locked
C. to lock
D. lock
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To get started with our business development, I suggested _______some market research first.
A. doing
B. to do
C. do
D. will do
3. 为什么通知易读
A. large
B. capital
C. short
D. simple
蒸汽机是由谁发明的?
A.本茨
B.里查德.特雷蒂克
C.瓦特
D.戴姆勒