　　(keep) healthy, and you are sure to get good grades.

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health; health health; healthy healthy; health healthy; healthy

Only if; will you Only if; you will Unless; will you Unless; you will

reject accept change choose

look for, keep healthy look after, stay health look after, keep healthy look for, stay health

Only if … will you Only if … you will Unless … will you Unless … you will

to keep health to keep healthy keeping healthy keep healthy

stay healthy to keep healthy be healthy are in good health

Unless; will you Unless; you will Only if; you will Only if; will you

Keep, more To keep, less To keep, fewer Keeping, less

healthier；wealthier the healthier；the wealthier healthy； wealthy the more healthy；the more wealthy

have having to have has

Only if; will you Only if; you will Unless; will you Unless; you will

Only if; will you Only if; you will Unless; will you Unless; you will

Only if；will you Only if；you will Unless; will you Unless; you wiIl

only if; will you Only if; you will Unless; will you Unless; you will

health, health healthy, healthy healthy, health health, healthy

Only if; will you Only if; you will Unless; will you Unless; you will

heath healthy be healthy to be healthy