---May I use your cup, Tom?---Sorry, it ________ by my sister just now. A.was broken B.is broken C.broke
______ is dangerous for children to swim in the river alone.
Be more careful and we can ______ these accidents.
The mother did all kinds of things to make her baby ______.
–Did you water the flowers yourself? --No, I got them ______.
Don’t ______ too late, or you’ll feel tired tomorrow.