He began to take political science___only when he left school.
| A．strictly | B．truly |
| C．carefully | D．seriously |
I shall not believe it until I see it_______ myself.
| A．for | B．of | C．by | D．in |
The little boys were tricks on the girl when their teacher came into the classroom.
| A．to play with | B．playing to |
| C．going to play for | D．about to play |
You did not perform as well as the other competitors--- ,you failed.
| A．in the end | B．after all |
| C．in other words | D．at the same time |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe |
| C．breathing | D．being breathed |
The fire made _____ difficult to rescue the people trapped under the ruins in the earthquake.
| A．/ | B．this | C．that | D．it |