everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as possible．
| A．Because | B．Since | C．While | D．If |
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
| A．the; the | B．/;a | C．/; the | D．the; a |
—What about ____ book?
—It’s too difficult ____ book for beginners.
| A．the; the | B．a; a | C．a; the | D．the; a |
Whenever you are in trouble ,don’t hesitate _____us for help.
| A．in asking | B．with asking | C．to ask | D．to asking |
It was the longest film we have ever seen ; it ____ three hours..
| A．lasted | B．ended | C．finished | D．completed |
___ was invented by Grain Bell..
| A．Telephone | B．The telephone | C．Telephones | D．The telephones |