.I would have called you up for help had it been possible, but I _____ your phone number then.
I think this shirt fits you. You can try it on if you ________.
— Do you still remember when we went to Nanjing? — I can't remember now but ________sometime last summer?
.If Bush _____his sister to attend the party, she will certainly be glad. She hasn't met Bush for years.
— I'm not the man ________the phone. She asked for Henry. — I'm sorry I was mistaken.
The step you have taken is ________ much risk(冒险).