根据汉语意思完成下列句子。 your pencil-box （把---收好）, please. You must look after your things.
------ (多久) do you have P.E. lessons?
------ Twice a week.She a birthday cake _ (给---买) me yesterday.
The teachers are _ (为---做准备) the meeting.
Mr. Brown can make model planes _ (手工).