根据句意及首字母或汉语提示完成句子。 1. In China, people usually s_____ hands when they meet for the first time. 2. The students are s_____ to wear their uniforms at school, aren't they? 3. You had better not k_____ the baby's mouth because she is ill. 4. —W_____ spoon is this? —It's Li Lei's. 5. —May I use the k_____ to cut the apple? —Yes, please. 6. —Could you please eat some delicious food again? —No, I am f_____ now. 7. Sometimes we can use some punctuation (标点) m_____ to express our emotions. 8. We should often _____ (实验)with our own ideas, so that we can improve our skills. 9. It's very important to use e-mail at the _____ (合适的) time. 10. I'm _____ (逐渐地) getting used to things.