When it ________ air pollution, Beijing faces the three “C”s, cars, coals and construction, which lead to Beijing’s thick air pollution.
| A．refers to | B．comes to |
| C．happens | D．speaks to |
From his _____look , we could see that he hadn’t expected that we could raise such ______
questions to him.
| A．confusing; confusing | B．confused; confused |
| C．confusing; confused | D．confused; confusing |
--What do you think made Mary so upset ?
---______ her new bicycle.
| A．As she lost | B．Lost | C．Losing | D．Because of losing |
The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.
| A．is | B．were | C．was | D．are |
The children talked so loudly at dinner table that I had to struggle ______ .
| A．to be heard | B．to have heard | C．hearing | D．being heard |
When Jason failed to pay his bill, the network company ______ his Internet connection.
| A．cut down | B．cut up | C．cut off | D．cut out |