Our women athletes achieved great success in the Vancouver Olympic Winter Games．—Yes No one could perform _____, I think．

Mary made coffee ________ her guests were finishing their meal.[ ]

Why don’t you attend the meeting _________ now?— I am sorry I can’t. I am preparing for the meeting __________ tomorrow.

He was unable to make such progress, _______.

Could I have a look at your i-phone5s, dad?——Oh, dear, if you_______.