Faced with a bill for $10,000 ,_________. [ ]

It was when I got back to my apartment ___________ I first came across my new neighbors.

The old man asked the children to _____ to each othernear the campfire so that he could start telling his story at once.

Sean has formed the habit ofjogging________ the tree-lined avenue for two hours every day

N1 flu, often _____ “swine flu” bythe public media, is a disease which can be prevented, controlled and cured