If you don’t know ________ the new robot toy, you’d better read the instructions first.
| A．where to mend | B．how to make | C．how to use | D．where to buy |
______ excellent singer she is !
A. What B. What an C. How
It has been five days ______ the little girl left home.
A. since B. after C. until
The man makes a living teaching.
A. for B. with C. by
The only language ____ is easy to learn is mother tongue.
| A．which | B．that | C．/ | D．it |
It is well-known that such a thing must ________ happening again.
| A．stop from | B．stopped from |
| C．be stopped from | D．to stop from |