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　　 a. The maths problem isnt easy enough for me to work out. 　　 b. The maths problem is ________ difficult ________ I cant work it out. 　　 c. The maths problem is ____ difficult ________ ______ _____ work out.　　a. The book is interesting enough for　everybody to read. 　　 b. The book is _____ interesting________ everybody likes to read　it. 　　 She was so weak that she couldn’t take care of her baby. She was __________ weak __________ take care of her baby.He is not old enough to do the work. ＝He is _________ _________ to do the work.A. of B. to C. that D. for ( )18、 We spend an hour _____ our homework every day. A. do B. to do C. doing D. did ( )19、Please keep the classroom ________. A. clean B. cleans C. to clean D. cleaning ( )20、_____ bag is on the desk. A. Mine B. My C. He D. Hers ( )21、The black shoes are _______. A.my B.your C.his D.her ( )22、A friend of ____ is going to be here. A.them B.theirs C.me D.us ( )23、He often teaches __ to play it. A.I B.me C. my D.mine ( )24、He asked us _____ after school. A. to play football B. played football C. plays football D. playing football ( )25、He can’t wait ______ the box. A.open B.opens C. to open D. to opening ( )26、The book is ______; I’m ______ in it. A. interesting/ interesting B. interested/interested C. interesting/interested D. interested/interesting ( )27、We arrived ____ late that there were no seats left. A.much B. too C. so D.such ( )28、There _____ an English evening last week. A. is B. will be C.was D.had ( )29、On ______ birthday, my parents gave me a new scooter. A. my five B.my fiveth C.my fifth D.mine fifth ( )30、She _____ him three years ago. A. see B.saw C.sees D.seeing ( )31、Tom was ill, _____ he didn’t go to school. A. or B.because C.