The old couple married for 40 years and never once____ with each other.
| A．they had quarreled. | B．they have quarreled |
| C．have they quarreled | D．had they quarreled. |
A computer can only do ____ you have instructed it to do．
| A．how | B．after | C．what | D．when |
He asked ____ for a violin．
| A．did I pay how much | B．I paid how much |
| C．how much did I pay | D．how much I paid |
What the doctors really doubt is my mother will recover from the serious disease soon．
| A．when | B．how | C．whether | D．why |
It is generally considered unwise to give a child _____he or she wants.
| A．however | B．whatever | C．whichever | D．whenever |
______leaves the room last ought to turn off the lights.
| A．Anyone | B．The person | C．Whoever | D．Who |