I _____ his telephone number. Had I known it, I would have rung him up.
| A．don’t known | B．didn’t know |
| C．hadn’t known | D．haven’t known |
Alice received an invitation from her boss, ________ came as a surprise.
| A．it | B．that | C．which | D．he |
Most people find it hard to ________Beijing Opera to foreigners because of cultural differences.
| A．get across | B．get over | C．come across | D．come over |
At the age of fifteen she gave up taking piano lessons to _____ her school work.
| A．hold on | B．call on | C．put on | D．concentrate on |
It is still under discussion _________ the old bus station should be replaced with a modern hotel or not.
| A．whether | B．when | C．which | D．where |
David is a skillful worker. I’m sure he has enough _______ to fix all the electronic ______.
| A．experience; equipment | B．experience; equipments |
| C．experiences; equipment | D．experiences; equipments |