1.fill in the blank with although,and,because,but,or,since,so,unless,until,when a.she has not called..........she left last week b.i saw him leaving an hour.......two ago c.this is an expensive...............very useful book d.we will go swimming next sunday.........it's raining e.i heard a noise........i turned the light on 2.có một lỗi sai trong câu.hãy tìm và sửa lại a.while we were on holiday,we were spending most of our time sightseeing b.Paul listened to his iPod,so he didn't hear the doorbell ring c.your new car is more intelligent student in our class d.he left college when he is 17 e.the children have put away their toys but they didn't made their beds yet f.would you mind waiting little minutes? g.when we were on holiday,we spent too a lot of money h.some flower bought for his mother on her birthday yesterday i.a new high school builds in our town next year