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The girls couldn't carry the box because it was too heavy.

2. I don't wear this jacket in winter because it is not warm enough.

3. Three people can't sit on the back seat because it is not wide enough.

4. We couldn't read the text because it was too difficult.

5. She can't wear the skirt because it is not long enough.

6. You can't use this water because it is not clean enough.

7. He can't drive a car because he is too young.

8. They can't win the game because they are too slow.

9. We can't walk to the market because it is too far-away.

10. The little puppy can't do this trick because it is not clever enough.