It shows that a knowledge of first aid can ______________.
--- I’ve passed the driving test! --- ______
I ______ pay Tracy a visit, but I am not sure whether I will have time this Sunday.
--- Excuse me, is this the right way to the Summer Palace?--- Sorry, I am not sure. But it ______ be.
I don’t like _________ you speak to her.
Alice received an invitation from her boss,__________came as a surprise.