The telephone _______ three times in the last hour, and each time it ________ for my father.
The girl looked at me with a _______expression. Maybe the problem was quite ______.
A quarrel _________, which made him ______ his family.
Our class _______ of thirty-two boys and twenty-three girls.
Now a lot of new technologies can ______ problems in industry.
When I returned home ,I found the window _____and something____.