Our teachers don't _____ us smoking cigarettes in the school
| A．agree | B．approve of | C．agree to | D．promise |
There is a notice board at the gate of the construction, _______ reads: Keep out without permission.
| A．which | B．on which | C．where | D．in which |
Completing all the homework by the dinner, John felt very tired. He __________all day long.
| A．was studying | B．studies | C．has studied | D．had been studying |
Though working outside, he is always ________ about his aging mother at home.
| A．satisfied | B．concerned | C．particular | D．excited |
-------The weather is terrible now; our earth is badly damaged!
-------Yes. It’s urgent that everyone _________ spare no effort to do something to save our world .
| A．must | B．would | C．should | D．shall |
Because the writer fell ill all of a sudden, the novel _____________ by the end of next month was put off.
| A．being published | B．will be published | C．to be published | D．published |