(用正确形式填空)Travelling by plane is _____ (much)comfortable than travelling by train．

(用正确形式填空)I can't choose which book _____ (buy)．

(用正确形式填空)Last summer she had an opportunity _____ (volunteer) at a school．

(用正确形式填空)There are so many students talking in the classroom．It's really _____ (noise)．

(用正确形式填空)It is good _____ (volunteer) at leisure time．

(用正确形式填空)The other day，my friends and I got to _____ (talk) about our studies．

(用正确形式填空)Students should be _____ (allow) to use dictionaries in the test．

(用正确形式填空)After lunch，the children are _____ (sleep) so they go to bed．

(填入恰当的介词)I would like to reply _____ the article Helping and Learning in your last newsletter．

(填入恰当的介词)This pair of jeans looks good _____ you．