--______ is your father? Does he still work as an engineer? --Yes, he has been an engineer for thirty years.
| A．Who | B．How |
| C．What | D．Which |
There are five pairs, but I'm at a loss which _____ to buy.
| A．to be chosen | B．to choose from | C．to choose | D．for choosing |
He suggested the person referred _______ put into prison.
| A．is | B．be | C．to be | D．should be |
She's too thin. She ____ gain some weight but she _____ too little.
| A．would, ate | B．will, eats | C．would, eats | D．will, ate |
He was not an actor, who often appeared on stage, _____ a writer, writing stories.
| A．but | B．and | C．then | D．so |
He transplanted the little tree to the garden _____ it was the best time for it.
| A．where | B．when | C．that | D．until |