It took a long time for the effective use of natural gas ______.
| A．making | B．being made | C．to make | D．to be made |
--- Is it convenient to you if I call you up at 9 o’clock tomorrow morning?
--- I’m afraid not. I _________ a speech then.
| A．was giving | B．will be giving | C．am giving | D．will have given |
He was very rude to the customs officer, ____ of course made things even worse.
| A．who | B．whom | C．what | D．which |
Students used to_____ information from newspapers or magazines, but now they are used to ______ for it on the Internet directly.
| A．get; search | B．getting; search | C．getting; searching | D．get; searching |
--- Why does she look so unhappy?
--- Her mother doesn’t _______ of her going to study in the United States alone.
| A．agree | B．permit | C．approve | D．prove |
Please keep me informed _________ the changes in case they affect our work.
| A．of | B．for | C．with | D．by |