He is too tired any longer.
| A．not to walk | B．to walk |
| C．walking | D．not walking |
Why not ____ your teacher for help when you can't finish _____ the story by yourself?
| A．to ask; write | B．to ask; to write |
| C．ask; writing | D．asking; to write |
—What him last night?
—He had an accident on the way home.
| A．took place to | B．happened to |
| C．took place for | D．happened for |
—Can I help you?
—Thanks. But I think the box is ______ heavy for you ______ carry.
| A．enough; to | B．not enough; to |
| C．too; to | D．too; not to |
Each man will be paid ______ his ability
| A．thanks to | B．because of |
| C．instead of | D．according to |
If more salt______ to the soup,it will taste better
| A．is added | B．will be added | C．will add | D．Adds |