________， he came to know how great his mother was.
| A．From then on | B．From now on |
| C．Since then | D．Ever since |
The reason ______ the delay is ______ we have had difficulty in obtaining materials.
| A．for;that | B．for;because | C．to;that | D．to;because |
I don’t think you will have any difficulty ______ a driving licence.
| A．to get | B．in getting | C．for getting | D．get |
People who are addicted ______ drugs can not go without them for a few hours.
| A．in | B．for | C．of | D．to |
I will do it myself ______ ask him to do it.
| A．than | B．instead | C．in place of | D．rather than |
Though she was disabled,she maintained a positive attitude ______ human life.
| A．of | B．to | C．on | D．for |