(2013·高考辽宁卷)One can always manage to do more things，no matter________full one’s schedule is in life.

You were out when I went to your housethis morning.—Oh, I _______ for a friend from Englandat the airport.

Many new problems will ________ when the new examination system comes into being.[ ]

My first summer vocation in the high school, _______I spent a fortnight on the farm, is really unforgettable

He is a writer _____ a singer.