Only under special circumstances ________to use the fire hose, otherwise they will be punished.
| A．are people permitted | B．people are permitted |
| C．people permit | D．do people permit |
Has all that ____ without delay ____ yet?
| A．can do…being done |
| B．done…been done |
| C．ought to be done…to do |
| D．should be done…been done |
I don’t think he could have done such a stupid thing last night, _____?
| A．did he | B．could he |
| C．do I | D．hasn’t he |
A man may usually be known by the books he reads _____ by the friends he keeps.
| A．as usual | B．as soon as |
| C．as if | D．as well as |
Although he is often tired _____ his work, he is never tired _____ his job. In fact, he enjoys it.
| A．of…with | B．with…from |
| C．with…of | D．at…with |
— Is your mother still a teacher?
— ______.
| A．Yes, she was | B．She didn’t use to |
| C．No, but she used to | D．No, but she used to be |