_______ most children nowadays are the only children, they tend to be more self-centered.
A．Ever since B．Now that C．Only if D．Even though
The middle-aged man said he would accept the job, so we have asked him to ________ his acceptance in writing.
A．confirm B．convey C．convince D．consider
__________ the clouds, you would find the airplane in the sky easily
A．Had it not been for B．If it were not
C．If it had not been for D．Were it not for
My toothache is killing me．I _____ it _____ away．But now it’s getting worse and worse.
A．think; is going B．thought; was going
C．have thought; is going D．had thought; had gone
—Jack, this is the third time that you have been late this week.
—Sorry, sir, but I was_____ for 15 minutes on the way here in the traffic jam.
A．held up B．put up C．taken up D．given up
—______ I lock the lab before I go home?
—Don’t bother．I’ll check it myself later.
A．May B．Must C．Can D．Shall
