The manager ______ the worker how to do it, or the accident couldn’t have happened.
| A．couldn’t have told | B．ought to tell |
| C．could have told | D．mustn’t have told |
—Would you like to come on Friday or Saturday?
—______
| A．Yes, of course. | B．Another is better. | C．What’s the matter? | D．Either is OK. |
. When talking about his road to success in an interview, he owed his success ______ his mother.
| A．for | B．in | C．on | D．to |
The style of Western art has changed many times ______ Chinese art has changed less often.
| A．while | B．before | C．since | D．however |
—Summer vacation is approaching. Have you decided how to spend it?
—Well, I consider ______ an English training centre to improve my spoken English.
| A．to attend | B．attending | C．to be attending | D．attend |
We have two spare rooms downstairs, ______ has been used for more than two months.
| A．neither of them | B．none of which | C．none of them | D．neither of which |