Is your mother a worker? No. she __________.A used to B was used to C used to be D used
The Changjiang River is _________in the world.
Daniel is my friend. 1 like to share my ________ with him when 1 am happy.
Please help ____ find ____.
--Is this ____ cap? --No, it’s not ____.
He is old, but he ____ have gray hair.