It’s hard for elderly people to see ______ convenience a smart phone can bring to us.
A．what B．which C．whose D．how
A large number of excellent films ______ all over the world over the past decades.
A．have produced B．have been produced
C．were produced D．produced
--- Who gave you this nice iPad?
--- Oh, it’s from my mother, if you ______ know.
A．may B．will C．must D．can
______ the deadline, the workers had to work overtime to get the job finished.
A．Giving B．Given C．Having given D．To give
The witness ______ an important detail when describing the accident.
A．brought about B．kept off
C．left out D．ran into
--- How about ______ plan to open a branch?
--- I should say it was ______ failure.
A．a; a B．a; / C．the; / D．the; a
