Choose the best words to complete the sentences.

Choose the correct option.

In my childhood, we had to scrape [on|away|up|by] on $200 a month. Sometimes we didn't even have enough money to buy food.

There are so many activities — I am afraid I got carried [on|away|up|by]!

If fewer than twenty students sign [on|away|up|by], the course won't begin.

This war between our families has been going [on|away|up|by] for decades now.