Everyone has periods in their lives________ everything seems very hard.
A．when B．where C．which D．That
—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
