Susan had quit her well-paid job and _________ as a volunteer in the neighborhood when I visited her last year.
is working
was working
has worked
had worked
-- How was your trip to London ? -- Great. I was helped by an organization. Otherwise, I _____ it.
I didn’t know that he was a cheat, or else I ________________ him.
If he had spent more time practicing speaking English before, he _____ able to speak it much better now.
They must have been enjoying themselves there,or they __________ so long.
Eye doctors recommend that a child's first eye exam ________ at the age of six months old.