[ Grammar ]
If you heat water, it …………………………………………. .
A. boils
B. boil
C. boiling

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Grammar › ViewThe doctor encouraged his patients ______ healthy food.
A. eating
B. eat
C. to eat
D. eat to
Grammar › View
Parents ____________ leave their children alone at home all times.
A. have not
B. do not
C. must not
D. ought not to
