1. if you don't study your mathematics, you can't be able to do the exercises
=> won't be able to
2. my niece can read by the she was four year old
=> when years
3. most ants could lift objects that are ten times heavier than their own bolies
=> bodies
4. bod was in an accident, but he won't be able to remember how he had hurt himself
=> couldn't
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Chúc cậu học tốt nhó :333