[ Grammar ]
_______ you know Mars ?
A. Are
B. Is
C. Do
D. Does

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Perfect Tenses › ViewLook at this wall. Someone _______________ (paint) a beautiful picture on it.
A. had painted
B. was painted
C. has painted
D. had been painted
Tenses › View
They _____ to Africa next Friday.
A. are going
B. are going to go
C. have gone
D. will go
Grammar › ViewThey swim every day. Look! They________.
A. a. swims
B. b. swam
C. c. is swimming
D. d. are swimming
Tenses and Articles › View
It took me _____ hour to finish the homework.
A. a
B. an
C. the
D. –