Nobodyknowsforsurehowdinosaurs

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Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.

A．must have happened	B．would have happened
C．should have happened	D．might have happened

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47. He earned scarcely enough to keep _____ together.

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B．body and soul

C．heart and soul

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48. _____ and butter ____ the daily food in west countries.

A．The bread; are

B．Bread; is

C．Both bread; is

D．Many bread; are

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49. ____ and friends should be few but good. (prov.)

A．Money

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50. John is on the bottle again. This sentence probably means _____.

A．John is standing on a bottle now.	B．John is holding a bottle now.
C．John threw away a bottle.	D．John begins to drink wine again.

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51. --- Who is at the _____ of all this trouble.
--- I don’t know.

A．base

B．bottom

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