小题1:It wasn’t very  _____ (有礼貌的)of you to serve yourself without asking．

小题2:Smoking is not  _____ (允许)in this restaurant．

小题3:Is the fire still  _____ (燃烧)?

小题4: Thanks to the policy, which the government is sending home-electric machines to farmers, they can pay much            (少的) money.

小题5:What was the most important            (发明) in the 20^th century.

小题6:After Jim answered the phone, he rushed out of the house   _____   (立即).

小题7:English dictionaries are very    ___   (use) to you when you study English.

小题8:I want to have the bike very much. But I can’t a          it.

小题9:The dresses_________ (本身) are made of common materials, but they sell well because of the famous designer.

小题10:He seldom__________ (回复) to the e-mails his friends send him.

为什么磷肥的利用率一般比较低？