1．It was not until he went abroad ________ he realized how important his family is to him.
答案：that
2．________ will be three days before he makes a decision.
答案：It
3．________ took me great courage to tell the truth.
答案：It
4．________was considerate of Michael to inform us of his delay in case we got worried.
答案：It
5．How was it ________ your brother succeed in finishing the difficult task?
答案：that
6．Is this the second time ________ you have been to Guangzhou?
答案：that
7．________ seems a pity to waste the food.
答案：It
