You are sure to fail the exam__________you study hard.
| A．if | B．unless | C．since | D．that |
Some girls won't go out without taking time to dress up.
| A．ourselves | B．yourself |
| C．herself | D．themselves |
_ 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.