____________caused the accident is still a mystery.
| A．How | B．What | C．That | D．Where |
John is very. －if he promises to do something he'll do it.
| A． | independent | B． | confident | C． | reliable | D． | flexible |
I have reached a point in my life ______ I am supposed to make decisions of my own.
| A．which | B．where | C．how | D．why |
The doctor recommended that you swim after eating a large meal.
A wouldn't B couldn't C needn't D shouldn't
The good thing about children is that they _______ very easily to new environments.
| A．adapt | B．appeal | C．attach | D．apply |
It took ______ building supplies to construct these energy-saving houses. It took brains, too.
| A．other than | B．more than | C．rather than | D．less than |