Had they known what was coming next, they ________ second thoughts.
| A．may have |
| B．could have |
| C．must have had |
| D．might have had |
—How about camping this weekend，just for a change?
—OK，________you want.
| A．whichever | B．however | C．whatever | D．Whoever |
In _________to being used in industry，laser can be applied to operations in the hospital.
| A．devotion | B．addition |
| C．application | D．Reception |
Children under 18 will not be ____into the pub in this country.
| A．designed | B．decorated |
| C．competed | D．Admitted |
No one knows when such a custom first _____.
| A．came into power | B．came into being |
| C．came true | D．came out |
This special cream will protect you _____ the burn-ing sun.
| A．with | B．about | C．from | D．Off |