单词拼写。

1. How do you feel about _____ (濒危的) animals?

2. Soft _____ (光线) makes people look good.

3. These restaurants can _____ (招待) many people every day.

4. Do you think it's _____ (公平的) that some restaurants are designed to be uncomfortable?

5. _____ (坚硬的) seats can also make people want to leave quickly.

平面四杆机构机械类型决定于机构内有无摇杆存在。