In 1942,Columbus_______ on the of the Bahama islands, but he mistook it for an island off India.
I spent five hours_____________ the book__________ I paid 10 dollars.
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.