——I am afraid I can’t return the book to you before Friday.
—— .
| A．Don’t be afraid | B．Be careful | C．Not at all | D．Take your time |
There was an old man wandering about the corner _____ waiting for someone.
| A．even though | B．even if | C．as if | D．in case |
John couldn’t finish his words ______ something had struck his throat.
| A．though | B．as though | C．when | D．since |
______was known to all,William had broken his promise ______ he would give us a rise.
| A．As;which | B．As;that | C．It;that | D．It;which |
Students shouldn’t be given so difficult a problem ______they can not work out.
| A．that | B．which | C．while | D．as |
____ is clear to us all, students should obey the school’s rules.
| A．As | B．What | C．Which | D．It |