Man still has _____ to learn about the most powerful and complex part of his body－－t

She has _______ been to Toronto, has she？A、alreadyB、neverC、everD、still

According to the man, an appliance store usually______.A．has a good reputationB．has the be

After a years study, she has learned enough English to______a conversation.A．carry onB．car

______, the professor is still trying to learn a new language.A．However he is oldB．Old as

Mary ____________her classmates has learned how to deal with the complicated problem.A

Only after he has acquired considerable facility in speaking______to learn to read and wri