1 . 说一说下列句中的that的用法，并比较不同。
1. We can infer that the purpose of Whaley’s project is to help students see their own strengths.
2. The fact that we talked about is very important.
3. Researchers from Georgia Tech say that they have come up with a low-cost device（装置）that gets around this problem: a smart keyboard.
4. It also doesn’t require a new type of technology that people aren’t already familiar with.
5. The fact that we succeeded in the experiment pleased everybody.
6. It takes sunscreen about fifteen minutes to start working, and that’s plenty of time for your skin to absorb a day’s worth of Vitamin D.
7. His plan is such a good one that we all agreed to accept it.