-What's up? You look worried.Well,I_____on the problem for 5 hours but I haven't got a single clue.
I never dreamed of there _______ a chance for me to be sent abroad. I can’t believe it.
To make _______ matters worse, Mr. Burrough lost his job last year. So the family are struggling to make _______ ends meet.
The boy was named _______ the hero who gave his life for saving him in the earthquake.
John is to attend the meeting _______ the manager, who has come down with a bad cold.
The microphone _______ them to keep in touch; in other words, it made it possible for them to contact each other.