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21.Father promised(答应) ____ _a new pair of glasses for me. A.buy B.bought C.to buy D.buying 22.The policeman asked the boys ____ there. A.dont stay B.didnt stay C.not to stay D.to never stay 23.Its very difficult ____ the old woman ____ skate. A.of; do B.to; make C.for; to D.by; on 24.Mr Brown was ____ for half an hour before dinner. A.too tired to lay down B.very tired so he lain down C.enough tired to lie down D.so tired that he lay down 25.Grandma couldnt keep up with me and I had to stop ____ her. A.to wait for B.waiting for C.to waiting D.waited 26.Please give me some paper ____ . A.to write B.to write on C.to write in D.write with it 27.____ English well is not easy. A.To learning B.To learn | 
