All the people at the conference are.
A. mathematic teachers
B. mathematics teacher
C. mathematics teachers
D. mathematic’s teachers
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Can you imagine what life will be like intime.
A. 20 years’
B. 20 year’s
C. 20-years’
D. 20-years
Tom lives on thefloor.
A. two
B. twice
C. second
D. seconds
I saw ______ playing in the street at that time.
A. them
B. they
C. their
D. theirs
Jim will give a short talk tomorrow.
A. we
B. us
C. our
D. ours