Tigers wait ______ it is dark, then they go out to find their food.
---You ________ my dictionary for half a year.---Sorry.I’ll return it soon.
—What should we do for the disabled children in the Children’s Home?—You’re supposed to________ a study group to help them.
Rose received a letter full of love from her parents on her ______ birthday.
My mother is busy today.She has many clothes after work.
I’m afraid that sweater is too expensive__________.