If you want to find some information about a foreign country, you can ask your friends _______ have been to that country.
-----What upsets him? -----_____ his computer is out of order.
— Frank, I’ve learned your plan. Could I make some suggestions? — ________.
We are kept ______ of what is happening in the world by reading newspapers and watching TV.
The time and effort he has devoted during the past few years _____ trees in that village are now considered to be very important.
— So you have met Maria? — Yes, it was last week ______ we attended Jack’s party.