---What color is it?---It's ____
| A．a pen | B．a red pen | C．a red | D．red |
---Is this your ruler？---______.
| A．Yes,it's | B．Yes, it isn't |
| C．No, it isn't | D．No,it is |
----Your backpack is very nice.
----________.
| A．Yes | B．No | C．Thank you. | D．Sorry |
-- _______.Is this your book?
| A．Sorry | B．Thanks | C．Excuse me | D．No |
___are his sisters.
| A．She | B．He | C．They | D．That |