--Thank you very much. ---______________.
| A．I'm OK. | B．That's OK. |
| C．That's right. | D．I see. |
_ the sun was shining, it wasn't very warm.
| A．Because | B．If | C．Although | D．Since |
I didn't sleep well because_ suddenly knocked on the door just now.
| A．somebody | B．nobody | C．anybody | D．everybody |
They're shoes with _ . People can use them for seeing in the dark.
| A．letters | B．lights | C．wheels | D．colors |
When you see the sign _____ in public, you must keep quiet.
—Mary, can I use your dictionary?
---Yes, __________.
A.enjoy yourself B.feel free C.no way