--What should I get my grandma for her birthday? -- Why ___ you ____ a scarf?
Can you learn English ________ chatting on the Internet?
He thinks _____ history about Chinese is very important.
How many states _______ the United States? Fifty.
My mother is strict both _____ me and ____ her work.
------ Do you know where Li Ming is working _____? ------ Maybe in Guangzhou, I think.