题目

（本题满分6分）如图，在△ABC中，∠ACB＝90°，D是BC中点，DE⊥BC，CE∥AD，若AC＝2，CE＝4．求四边形ACEB的周长． 答案：解析:略根据句意及所给汉语意思写出所缺单词。小题1:I usually make ___            ( 错误  ) in grammar.小题2:He can’t____            ( 负担得起  ) to pay for his child’s education.小题3:I can’t go to the party, because I’ll have a big ____          ( 考试)tomorrow.小题4:We were very  happy , when we were  having  a  _____             ( 野餐 ) last week.小题5:There  are many _____            ( 会员 )waiting for our director in the hall.