Only when __________________ permission _______________ allowed to enter the lab.
| A．a teacher has given; are the students | B．has a teacher given; are the students. |
| C．has a teacher given; the students are | D．a teacher has given; the students are |
American women usually consider their best friend as someone ________ they can talk frequently.
| A．who | B．whom | C．about which | D．with whom |
There are two buildings, _______ stands nearly a hundred feet high.
| A．the larger one | B．the larger of them | C．the larger one that | D．the larger of which |
The crowd went _______ when they saw the famous star. They were crazy!
| A．painful | B．sensitive | C．wild | D．confident |
Cell phones _______ by more and more teens and many new functions _______ to them nowadays.
| A．are using, have added | B．is used, are adding |
| C．are being used, have been added | D．being used, were added |
— The couple _______ after 10 years’ marriage.
—What a pity. Their child may suffer a lot from this.
| A．broke out | B．broke down | C．broke up | D．broke into |