The stone on the river bank rolled under her feet; she was _____into the river,and she called out for help.
The book was written ______ careful observations and detailed studies.
You had better ______some time every day for sports so that you can keep yourself energetic.
Don’t take it seriously, Alice. I wasn’t making ______ fun of you — it’s nothing but ______ joke.
My neighbor asked me to go for _____ walk, but I don’t think I’ve got ____ energy.
______ at my classmates’ face, I read the same excitement in their eyes.