21.Here’s one of the best ways to protect your skin—_____ too much sunshine.
| A．not to absorb | B．not having absorbed |
| C．having not absorbed | D．don’t absorb |
John shut everybody out of the kitchen _______ he could prepare his grand surprise for the party.
| A．which | B．when |
| C．so that | D．as if |
_______ rich one may be there is always something one wants.
| A．whatever | B．Whenever |
| C．however | D．Wherever |
________ the grandparents love the children, they are strict with them.
| A．While | B．As |
| C．Since | D．Because |
_______ the punishment was unjust, he accepted it without complaint.
| A．So long as | B．Even though |
| C．Since | D．While |
He is better than _______ I last visited him.
| A．when | B．that |
| C．how | D．which |