Experience doesn't always _____ to the problem we are faced with.
| A．make a choice | B．make a difference | C．make up | D．make out |
A good friend is a person _______ we Turn for help when we are in trouble.
| A．who | B．whom | C．to whom | D．to which |
It was almost eight years Iater _____ the young man got his doctor's degree and became an engineer.
| A．since | B．when | C．before | D．that |
Lily managed to accomplish ______ the teacher encouraged her to do.
| A．that | B．what | C．which | D．whether |
I've achieved a lot in my study, thanks to ____ who helped me.
| A．others | B．those | C．ones | D．these |