19.Jack's family has a computer at home. (A) He usually uses the computer at the weekend. When he is at school,he has computer lessons twice a week.He often downloads music.He likes pop songs.Sometimes he plays computer games like Counter Strike.He often sends emails (B)_____his sister.She is in Beijing.Jack's father uses the computer to make a timetable(日程表) for his work.And Jack's mother is an English teacher.She gets information for her lessons on the Internet in the evening.They like this computer very much.
(1)翻譯文中(A)處畫線句子
(2)How often does Jack have computer lessons at school?
(3)填出(B)處的介詞
(4)What does Jack's father use the computer to do?