After her son died in a car accident, the old lady would sit at the window, ______ out and _______ in thought.
| A．looked; lost | B．looking; losing |
| C．looked; losing | D．looking; lost |
------- What is the price of petrol these days 
-------Oh, it ______ sharply since last month.
| A．is raised | B．has risen | C．has arisen | D．is increased |
At present, one of the apartments in favor of the new airport ________ that it will going a lot jobs to the area.
| A．is | B．are | C．will be | D．were |
It was _____ he came bank from Africa that wear _________ he met the girl he would like to marry.
| A．when; then | B．not; until | C．not until; that | D．only; when |
The house I grew up ________ has been taken down and replaced by an office building.
| A．in it | B．in | C．in that | D．in which |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |