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单项选择题： 1. I, ___your good friend, will try my best to help you out. A.who is B.who am C.that is D.which am 2. The old man has two sons, ___are lawyers. A.both of them B.both of who C.both of whom D.both of they 3. He is a man of great knowledge, ___much can be learned. A.in whom B.about whom C.from whom D.of whom 4. I can tell you ___he told me last week. A.all which B.all what C.that all D.all that 5. Is oxygen the only gas ___helps fire burn? A.that B./ C.which D.what 6. Air, ___we breathe every day, is around us all the time. A.that B./ C.which D.it 7. This is the museum ____we saw an exhibition the other day. A.that B.which C.where D.in that 8. This museum is ___you visited the other day. A.that B.which C.where D.the one 9. This is the museum ___you saw the other day. A.that B.where C.in which D.in that 10. It is the third time ___late this month. A.that you arrived B.when you arrived C.that youve arrived D.when youve arrived 11. It was in 1969___the American astronaut succeeded in landing | 
