The teacher had the students __________ all the words they didn’t know.
| A．looked up | B．looking in | C．look up | D．look at |
Some people fear that ________ air pollution may bring about changes in ________ weather around the world.(2009·江西)
| A．/；the | B．the；/ | C．an；the | D．the；a |
Sam has been appointed ________ manager of the engineering department to take ________ place of George.(2012·重庆)
| A．/；/ | B．the；/ | C．the；the | D．/；the |
Eggs are sold by ________ dozen while the meat is charged by ________ weight.
| A．the；the | B．the；/ | C．/；the | D．/；/ |
Last Sunday，we took ________ guided walk around by ________ signs of the famous town.
| A．the；the | B．a；/ |
| C．the；/ | D．a；the |
________ China's growth is not ________ threat to others.On ________ contrary, it will bring more opportunities to the world.
| A．The；a；/ | B．The；/；the | C．/；a；/ | D．/；a；the |