I will visit Austria ______ the invitation of my friend this summer vacation.
A.by B.for C.to D.at
—Is there any mail?
—No, ______ at all.
A.nothing B.none C.no one D.neither
Programmes, ______ to bring the old and the young together, are growing in popularity all over the world.
A.designed B.to be designed
C.designing D.having designed
David _____ a customer when the fire started.
A.served B.was serving C.had served D.would serve
Martin drove along ______ he found a convenient parking place.
A.after B.when C.until D.since
—Excuse me, visiting hours are over.It' s time for you to leave.
—I' m sorry, I didn't know the time or I ______ earlier.
A.will leave B.would leave
C.had left D.would have left