All the students in my class can’t ______ the math problem. It’s too difficult for us.A. work on B. work out C. work for
—How long have you _e? _____ the bike over ther—For two days.
—Is that boy under the tree Li Ming?—No, it _______ be Li Ming. He is in Shanghai now.
—What’s _______ movie theater in your city?—Town Cinema. It has the most comfortable seats.
My sister was writing an e-mail _______ I was watching TV at this time yesterday.
On my ______ birthday, I got a guitar as a gift from my father.