To get a better grade, you should ______ the notes again before the test.
—Are you going to Dalian by air?—No, the tickets are ____expensive for me.
He will have learned English for eight years by the time he _____ from the university next year.
—Could you spare me one minute, Bob? I have a favor to ask you.—_____.
The world was deeply ________ with the Green Olympics held in China in 2008.
The students were ________ over the ________ problem,listening to the teacher with a ________ expression on their faces.