_____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the world every day.
A．Having opened B．Opened C．Opening D．To open
I’m not sure exactly how much money you’ll receive, but it will __________ cover your major expenses.
A．firmly B．roughly C．relatively D．urgently
________ I cannot understand is ________ she wants to resign her present job.
A．What; why B．Which; how C．That; why D．What; which
_______ 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
