Complete the sentences with for or since.
1. They have been waiting 6 o’clock.
2. I haven't been saving money years.
3. You have been watching TV three hours.
![Shutterstock_167358809.jpg](https://resources.cdn.uzdevumi.lv/17ca2159-f7c3-4546-94d2-dc650e01d8ff/Shutterstock167358809w300.jpg)
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