22. She used to drink milk and eat tons (or tonnes) of chocolate
At some time in the past she was having a lot of milk and chocolate. She stopped doing it. The implication is that she does not do it now.
23. She is swimming in the river.
This suggests that she is swimming in the river right now.
It can also mean that she is swimming in the river regularly, even if not at this very moment. For example: "She is swimming in the river. Almost every day".
24. To steal.
-does it mean to take away something by force?
Possibly, or by stealth. It most commonly means to take something that does not belong to you.
However it has other meanings depending on the context: To steal a kiss. To steal a base. To steal a glance. To steal away into the night.
A place where you prepare food, so it usually contains an oven.