.
Most pop music is influenced,__________a greater or lesser degree, by the blues.
| A．to | B．on | C．for | D．within |
You are working too hard. You'd better keep a ________ between work and relaxation.
| A．promise | B．read | C．balance | D．diary |
It is by no means clearthe president can do to end the strike.
| A．how | B．which | C．that | D．what |
When deeply absorbed in work, ________ he often was, he would forget all about eating or sleeping.
| A．that | B．which | C．where | D．when |
When you are done with the book, just give it to Lucy or Helen or __________.
| A．whoever | B．wherever | C．whatever | D．however |
Nothing is so easy as ________ parents to raise their expectations of their children too high.
| A．of | B．to | C．by | D．for |