Tom sat under a tree chatting with his friends and _____ his teacher, stood up in no time.
| A．seeing | B．seen | C．saw | D．to see |
The WTO can't be called _____ "world" organization without ____ world’s largest nation-Russia．
| A．the; a | B．a; a | C．the; the | D．a; the |
Apple sold ____ tablets ,the new ipad, in September alone as Samsung Galaxy series.
| A．more than twice | B．as twice as many | C．twice as many as | D．more than twice as many |
The ___ bear was cornered in the forest __ hunters were closing for the kill.
| A．frightened; where | B．frightening; when | C．frightened; as | D．frightening; before |
The Meglev Train travels in a vacuum between two magnets, ___ no pollution is caused and less energy is consumed.
| A．where | B．which | C．when | D．therefore |
Do be careful with what you are to say. If you ___, you will leave a bad impression.
| A．don’t | B．aren’t | C．won’t | D．can’t |