-Car prices have been going down sharply in the last 20 years.
-It's not surprising because the law of market __________ the price of a product.
| A．is controlling | B．controls |
| C．has controlled | D．controlled |
We were talking and laughing, when our teacher came in and asked us what all the ______ was about.
| A．excite | B．exciting | C．excited | D．excitement |
The elevator _________ and we were trapped inside for half an hour.
| A．broke off | B．broke in | C．broke out | D．broke down |
--- Jim failed again in the maths examination.
--- Don't scold him too much. _____ , he has tried his best.
| A．After all | B．Above all | C．At all | D．In all |
The conference has been held to discuss the effects of tourism ______ the wildlife in the area.
| A．in | B．on | C．at | D．with |
The International Red Cross is ______ non-profit organization that cares for the wounded, sick and homeless in wartime, and victims of _____ natural disasters.
| A．the; the | B．a; the | C．the;不填 | D．a; 不填 |