David, _____ I have been sharing a dorm for more than two years, is quite a funny guy.
A. of whomB. with whomC. in whom D. from whom
--The mistake_____, I had been more careful.
---But you weren’t at that time.
A. might have avoided B. would avoid
C. would be avoided D. might have been avoided
---Excuse me, is this seat______?
---yes. Go ahead.
A. occupied B. flexible C. temporary D. vacant
China's first moon rover, Yutu, or Jade Rabbit touched the lunar surface at 9:14 a.m.on December 14,2013, ________deep trace on the loose lunar soil.
A. left B. leaving C. Having left D. To leave
When you arrive at your job in the morning, let the first thing you say_____ everyone’s day
A. to brighten B. brightening C. brightened D. brighten
The reason ______ Tom came to attend the meeting was ______ he was an expert in this field.
A. why; that B. why; whether C. that; why D. why; because
