—Oh，it’s you！I didn’t________ you.
—We haven’t seen each other for several years.Glad to meet you again.
| A．realize | B．recognize | C．know | D．see |
Substances will expand or contract ______ heated or cooled, but this is not the case with water.
| A．when they will be | B．if they will be |
| C．as they being | D．when |
You can arrive in Beijing earlier for the meeting __ you don’t mind taking the night train.
| A．provided | B．unless | C．though | D．until |
The old woman has loved Tom _____ he were her son.
| A．because | B．as | C．if | D．as though |
She heard a terrible noise, ___brought her heart into her mouth.
| A．it | B．which | C．this | D．that |
They agreed to rent the house ______ the roof should be repaired.
| A．on condition that | B．as soon as | C．when | D．unless |