She went to the bookstore and bought _________.
| A．dozen books | B．dozens books | C．dozen of books | D．dozens of books |
It was the first time ______ I ______ here.
| A．when; had come | B．that; have been | C．when; came | D．that; had been |
Remember never to leave your dog ______. It might bite people around.
| A．lose | B．lost | C．losing | D．loose |
_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
_____improve her English, Jenny bought a lot of tapes for herself.
| A．So as to | B．In order that | C．So that | D．In order to |
They became good friends during the war, and since then their lifelong friendship has______ tests of life and death.
| A．gone through | B．got through | C．stood up | D．cleared up |