1. —他就是昨天我在大厅里看到的那个人。
    —That’s the mall I saw in the hall yesterday.
    —你能确信吗？
    —______ you ______ ______ that?
2. 他同意和我一起去那里。
He said yes ______ ______ there with me.
3. 我爸爸自去年退休后体重增加了。
My father has ______ ______ ______ since he was retired last year.
4. 最重要的是，我们必须保持身体健康。
______ ______, we must keep fit.
5. 有人认为将来人们会很经常地到月球上旅行。
______ ______ that people will travel to the moon quite often.