单项选择题
I’ve been waiting for him for （）hour and （） half.
A. a.../ B. an... a C. an.../
单项选择题 Tell Mr. Wang to go to Mr. Li’s office when you （）him.
单项选择题 --Hello, Alice. You （） very happy.--Yes. I am happy. My parents are coming to see me tomorrow.
单项选择题 Sir, may I ask you（）questions
