If metal is heated and then cooled very quickly, , by dipping in cold water, it will be very hard but will break easily.
| A．what’s more | B．in general | C．for example | D．on the other hand |
Class regulations require ______ is the last to leave the classroom ______ off all the lights.
| A．who; should turn | B．whomever; turn |
| C．whoever; turning | D．whoever; turn |
He was not really in the mood for anything ______ it dawned on him that it had not been his fault.
| A．since | B．when | C．after | D．until |
No progress was made in the trade talk as neither side would accept the conditions of ______.
| A．others | B．the other | C．either | D．another |
______, in some areas the electricity was cut off, ______ residents in 8 counties spend their lunar New Year’s Eve in darkness.
| A．Making matters worse, making | B．What was worse, to make |
| C．Worse still, making | D．To make matters worse, to make |
She was afraid that unless the train speeded up she would miss her ______ to Scotland.
| A．ticket | B．place | C．seat | D．connection |