don’t know how it ___________ that our car was bumped from behind.

I once worked in the English Department in the university but I got laid off because I _____ the courses required for further education. Meanwhile my colleagues were still there, ______ easy money.[ ]

What ____ heavy rain it was! —Yes, but I love _____ air after it rains. It smells so fresh.

It was in such a good place _____ everyone wanted to go and visit _____ I came across the old lady．

I wonder _______. —By searching the Internet.