He traveled to many mountain villages and saw many poor children out of school. This experience ___________ his life.
| A．would change | B．had changed |
| C．was to change | D．was changing |
Mother told me ______ near the river.
| A．don’t play | B．not to play | C．not play | D．not playing |
His friends ignored his advice, ______ they knew it to be helpful.
| A．as if | B．since | C．even if | D．so that |
I ______ along the road when I saw Peter. So we stopped and had a chat.
| A．walked | B．was walking | C．would walk | D．had walked |
Betty will ring me up as soon as she ______ in Beijing.
| A．arrive | B．arrives | C．arrived | D．will arrive |
The teacher requested that we ______ the classroom after using it.
| A．cleaned | B．cleaning | C．to clean | D．clean |