------ May I smoke here?
------ If you____, that's the smoking section over there.
| A．should | B．could | C．may | D．must |
—Would you please help me carry this heavy box upstairs?
—______.
| A．My pleasure | B．With pleasure |
| C．For pleasure | D．A pleasure |
When the party was over, he ______ his friends good-bye and ______.
| A．bade; departed | B．said; left |
| C．waved; went | D．remarked; retired |
________ doesn’t seem to have been any difficulty solving the problem.
| A．There | B．It | C．He | D．That |
Joan had often heard ____ said that Marley had no money.
| A．one | B．it | C．once | D．her |
Carl Linnaeus made great contributions to ________ plant species.
| A．group | B．have grouped | C．grouping | D．been grouping |