读一读，补全对话
A: Hello, Mike!
B:
A: Where's my pen?
B:
A : No, it isn't.
B: Is it in your hand?
A: 
---How much is this dress? --- _______.
A. It’s prettyB. It’s too expensiveC. 99 yuan
---What’s the weather like today? --- _______.
A. It’s sunnyB. There is the sun. C. Close the window.
---Is that your sweater? --- _______.
A. No, it is.B. Yes, it is.C.Yes, it isn’t.
What time is it ? It’s _______.
A. 8B. 8 o’clockC. clock’s 8
Welcome to our _______！
A. schoolB. homeworkC. students