We must work hard and never ________ in our efforts.
A. relax
B. leak
C. reflex
D. reflect
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The boy is so strong that he can ________ a telephone book in half.
A. punish
B. tear
C. span
D. credit
The train is going at the ________ of 120 kilometres an hour.
A. rate
B. rent
C. remote
D. tap
Instant foods are gaining ________ in many countries.
A. enthusiasm
B. pollution
C. popularity
D. strength
A quarterly is ________ four times a year.
A. improved
B. repeated
C. produced
D. issued