seems to be one of the main reasons for many people in today’s world.
| A．Having an adventure; to travel | B．To have an adventure; traveling |
| C．Have an adventure; to travel | D．To give an adventure; traveling |
It was not long_____ he got to know it.
| A．when | B．before | C．after | D．until |
It is five days_____ we came here.
| A．when | B．before | C．as | D．since |
I have not seen him_____ he went to college.
| A．when | B．before | C．as | D．since |
They did not stop fighting_____ there was no enemy left.
| A．until | B．after | C．when | D．since |
I was about to leave my house _____the phone rang.
| A．while | B．when | C．as | D．after |