High way and air transport will have to compete with _____ service for passangers nowadays.
He is having a family party in ________of his 84th birthday .
It is important to know about the cultural differences that________cause problems.
When Premier Zhou Enlai was alive,he________work from morning until night every day,dealing with numerous affairs.
—May I tell this to my close friend? —No,you________.Never let anybody else know about it.
—Why didn’t Alex attend the party yesterday evening? —He________not have wanted to see me.