请找出下面句子的意思，写上编号。
Wehaving an English lesson. A. /B. areC. can
Let's read. A. bookB. a bookC. the book
—Happy birthday! —. A. Excuse meB. No，I'm not happyC. Thank you
—I come in? —Come in，please. A. DoB. AmC. May
Look atsun. It's big and red. A. aB. theC. /
having an English lesson.
.
.
I come in?
sun. It's big and red.
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