根据句意和语法要求完成下列句子。（满分15分，每小题1分）
小题1:My two brothers are both ___________(policeman).
小题2:_________ would be good for you to have a holiday.
小题3:Did you enjoy_________ at the party yesterday?
小题4:Guo Yue did quite well at the World Table Tennis Championship, but Zhang Yining did even___________(well).
小题5:It’s raining_________(heavy). We have to stay at home instead of going fishing.
小题6:Professor Williams keeps telling his students that the future_________(belong) to the well-educated.
小题7:I know a little bit about Italy as my wife and I_________(go) there several years ago.
小题8:The flowers were so lovely that they______(sell) at once.
小题9:Now they ________(build) a new cinema here.
小题10:This is the first time that we_________(see) a film in the cinema together as a family.
小题11:This is the station_________ I saw Tom off.
小题12:There was a time__________ children hated to go to school.
小题13:Those _________are present at our class are all experienced teachers.
小题14:This is the book _________cover is blue.
小题15:_________ is known to all, the earth is round.
a 
a，a2＝
a