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**Bài tập điền vào chỗ trống với "can", "can't", "could" hoặc "couldn't".**

1. I’ve read that poem three times, but I __________ understand its inner meaning.
2. Eleanor won a national swimming competition because she __________ swim really well.
3. Because her flight was delayed for an hour, she __________ get to the meeting on time.
4. Ruby and her brother looked for her glasses everywhere but they __________ find them.
5. Hunter __________ remember 1,000 digits of Pi by the time he was only seven years old.
6. I __________ do this maths homework without my older sister’s support; it’s so difficult.
7. Minh __________ speak Korean when he lived in South Korea, but he has forgotten most of it now.
8. These boxes are so heavy that I __________ lift them. __________ you give me a hand, please?
9. It’s a pity the sales team __________ reach their target last year. - What __________ they do to boost their sales this holiday season?
10. Bennett __________ ice-skate brilliantly, but he __________ join the city’s figure skating team because the coach is extremely selective in his choice of players.