初三英语题、谢谢

1.at that time/at that moment后面跟过去时还是完成时？

2.He is sure of his success.(同义句)
He is sure that he __________ .

3.医生的酬金你付了吗？
Have you __________ yet?

4.吃晚饭时是用at supper还是in supper?

谢谢、
谢谢，第一个句子是

At that time,I __________(see) that he put a pen into his bag.

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