（选用介词 of 或 for 完成句子） It's kind __________ Lucy to give the seat to the old lady on a bus．

（选用介词 of 或 for 完成句子） It's generous __________ your mother to give as so much delicious food．

（选用介词 of 或 for 完成句子） It's bad __________ your teeth to eat too much sweet．

（用所给动词的正确形式填空） ________ (not argue) with your mother．She just wants to help you solve your problem．

（用所给动词的正确形式填空） She is an active girl．She practices ________ (dance) for an hour every day．

（用所给动词的正确形式填空） You'd better give up _________ (smoke)．It's bad for your health．

（用所给动词的正确形式填空） All these boys _________ (divide) into two groups tomorrow．

（用所给动词的正确形式填空） He _________ (recommend) me for a Party member in 2004，so I have been in

the Party for two years．

（用所给动词的正确形式填空） Gilbert(吉尔伯特) _________ (discover) electricity(电)，but Edison(爱迪生) ________ (invent) the electric light bulb．

（用所给动词的正确形式填空）John is a hard-working student and he often ________ (come) first in the exam．