George Bush, the former US president, has taken up oil painting since he left the White House, revealing that painting _______ his relaxed lifestyle．
| A．allowed for | B．consisted in |
| C．stuck to | D．contributed to |
People in ancient times ______ series of important events so that we now have what is called history.
| A．went down | B．kept down | C．set down | D．broke down |
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 |