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1. When I was a child, I ______ climb trees very easily.
Answer: **b) could**
2. I'm sorry, but I ______ not attend the meeting tomorrow.
Answer: **a) can**
3. After months of training, she ______ finally run a marathon.
Answer: **c) is able to**
4. He ______ speak three languages fluently.
Answer: **a) can**
5. They ______ finish the project by the deadline last week.
Answer: **c) were able to**
6. In the future, we hope we ______ travel to Mars.
Answer: **c) will be able to**
7. Despite the heavy rain, they ______ reach the top of the mountain.
Answer: **c) were able to**
8. You ______ use my phone if you need to call someone.
Answer: **a) can**