Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.
| A．it; what | B．what; what | C．what; it | D．it; it |
Experts believe people can waste less food by shopping only when it is necessary.
| A．why | B．where | C．that | D．what |
makes the book so extraordinary is the creative imagination of the writer.
| A．That | B．What | C．Who | D．Which |
As a new graduate, he doesn’t knowit takes to start a business here.
| A．how | B．what | C．When | D．which |
A student should always be curious , then do well in his studies.
to learn B. about learning C. in learning D. for learning
People have always been about exactly how life on earth began.
| A．curious | B．excited | C．anxious | D．careful |