Living in the central Australia desert has a lot of problems, _______ getting water is the worst.
| A．for which | B．to which | C．of which | D．in which |
His writing is so confusing that it’s difficult to make out _______ it is that he is trying to express.
| A．that | B．how | C．what | D．who |
Whatever is left over may be put into the refrigerator, _____ it will keep for two or three weeks.
| A．when | B．which | C．where | D．while |
If parents have children help with housework, the children will feel needed. , they will learn to take care of themselves.
| A．On the contrary | B．What’s more |
| C．That is to say | D．In a word |
I made a promise to myself _______ this year, my first year in high school, would be different.
| A．whether | B．what | C．that | D．how |
Nothing is so easy as _____ parents to raise their expectations of their children too high.
| A．of | B．to | C．by | D．for |