He has his faults, but _____ he is an excellent teacher and we all respect him.
30.—Why did you leave the lights burning? —Heavens! I guess I__________to turn them off.
35. —Did you attend David’s wedding last night? —No. I ________ before that.
34. The man showed us so heavy a stone _______ no man can lift.
33. To improve your reading ability, you should ____ half an hour every day for learning new vocabulary.
32. This disaster ______ that people had no knowledge of first aid and they hadn’t known how to protect them-selves in face of danger.