Only when he put his foot into the river________that the water was too cold to swim in.
| A．he realized | B．did he realize |
| C．had he realized | D．he had realized |
—What about going to the restaurant for a meal?
—_________.but I’m afraid_________.
| A．I’d like to;I can’t afford to |
| B．I’d like it;I can’t afford it |
| C．I’ll be glad;I can’t afford to |
| D．I intended;I can’t afford it |
_________ for his good skill,this doctor has a lot of visitors calling for help all the time.
| A．Knowing | B．To know |
| C．Known | D．To have known |
When she was crossing the room the nurse happened to notice the old lady_________to get out of bed.
| A．tried | B．trying |
| C．to try | D．had tried |
He’ll be very upset if you_________his offer of help.
| A．turn off | B．turn out |
| C．turn over | D．turn down |
.—Have you moved into the new house?
—No,the building is_________ construction.
| A．at | B．under | C．for | D．in |