<正>1. (MET 1992,20) The doctor will be free.A. 10 minutes later B.after 10 minutesC. in 10 minutes D. 10 minutes after2. (MET 1992,35) Did you have trouble the postoffice?A. to have found B. with findingC. to find D. in finding3. (MET 1993, 14) If you keep on, you'll succeedA. in time B. at one timeC.at the same time D.on time4. (MET 1993, 39) We offered him our congratulationshis passing the college entrance exams.A.at B.on C.for D.of