--Is it _____ pen? --Yes. It' s ______ orange pen. A a; a B. an; an C. a; an D. an; a
---______ shells do you have? ---Over 100 so far.
---______ did you first skate? ---Two years ago.
We are going to have a party ______ money for the poor people.
Sorry, Jim. I don’t have ______ time ______ with you. --- That’s all right.
---______ have you been in class today? ---For two hours.