—Is this your backpack?
—Yes, _______.
| A．This is | B．it is |
| C．it’s | D．it isn’t |
—What’s this?
—It’s_______.
| A．key | B．keys | C．a key | D．a keys |
_______, Linda. What’s this in English?
| A．Excuse me | B．Thank you |
| C．I’m sorry | D．Excuse |
—Your English is very good.
—_______.
| A．Excuse me | B．No, it isn’t |
| C．Thank you | D．That’s OK |
That is_______ apple.
| A．a | B．an | C．the | D．/ |