初中英语情态动词的被动语态选择题

— Why do some whales have to       ？

— Because humans catch whales for meat，fat and oil.Some of them are       .

A．protect；dangerous

B．protect；endangered

C．be protected；dangerous

D．be protected；endangered

﹣﹣﹣This math problem _______ in half an hour.

﹣﹣﹣Don't worry.Mr.Wang is good at math.He can make it.（　　）

A．	is working ou	B．	would work out
C．	should be worked out	D．	has worked out