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13. He isn't strong. He can't lift such a heavy box.
>He isn't
14.This question is too difficult for him to answer.
=>This question is
15. He isn't rich. He can't buy the house.
He isn't
16. Peter is too young to be in our class.
=>Peter isn't
17. This dress isn't cheap enough for me to buy.
=> This dress is
18. She intends to study abroad.
=>She is
19. We plan to visit Nha Trang.
=>We are