[ Grammar for TOEFL ]
_____ heated by solar energy have special collectors on the roofs to trap sunlight.
A. A home is
B. Homes are
C. A home
D. Homes
Select your answer:

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Grammar › ViewThe moon _______ around the earth.
A. go
B. goes
C. going
D. gone
Tenses › View
We _____ already _____ the tickets. We _________ this Monday. ( to get / to fly )
A. have ____ got / flown
B. did _____ get / will fly
C. are _____ getting/ are flying
D. have ______ got / are flying
