[ TOEFL ]
The upper levels of the sun’s atmosphere are of very low ______ heats the gases there to very high temperatures.
A. dense and solar
B. density, solar activity
C. density, but solar activity
D. density and the activity of the sun is
Select your answer:
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Grammar › ViewWe . . . to the library yesterday.
A. study
B. studied
C. studying
D. studies
Conditional Types › View
Type 0
If you leave margarine under the sun, ………………………. .
A. it doesn’t change
B. it melts soon
C. it freezes in a short time