[ TOEIC ]
Sustainable ______ is the key indicator of the long-term health of the economy.
A. produce
B. to produce
C. productive
D. productivity

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Tag Questions › ViewYou haven’t tidied your room,_______
A. have you?
B. do they?
C. aren’t we
D. was it?
E. haven’t you
Grammar and Vocabulary › View
Look at that man! He ____________ off his ladder is he isn’t careful.
A. is going to fall
B. is falling
C. will fall
D. falls