33. ________ in the fields on a March afternoon, he could feel the warmth of spring.
I will visit Austria ______ the invitation of my friend this summer vacation.
—Is there any mail? —No, ______ at all.
Programmes, ______ to bring the old and the young together, are growing in popularity all over the world.
David _____ a customer when the fire started.
Martin drove along ______ he found a convenient parking place.