. It was so noisy out side that he couldn’t down to read.
When the old man_____to walk back to his house,the sun____itself behind the mountain.
I wrote a letter of complaint(投诉),and the airline have promised to _______the matter.
I’m happy that you agreed to work with us again.and I look forward to______you next week.
-- Could I use your computer for a few moments, please? --- ________. I’m not using it myself.
People have always been curious _________ how living things on the earth began.