How many times______ not to play with fire?
－I’m sorry. I’ll never do that again.
| A．do you tell | B．had you told | C．are you told | D．have you been told |
It is ________ world of wonders, ________ world where anything can happen.
| A．a; a | B．a; the | C．the; the | D．the; a |
Father ________ for London on business upon my arrival, so I didn’t see him.
| A．has left | B．left | C．had left | D．was leaving |
The boy’s dream was to have his own laboratory ________ to try out some of his own ideas.
| A．from which | B．in which |
| C．by which | D．at which |
There is a common belief among them ________ rubbish can should be put to good use.
| A．which | B．what | C．whether | D．that |
The happy ________ of children playing in the garden disappears, and it is quiet again.
| A．spot | B．view | C．scenery | D．scene |