1. 昨天我花了大约两小时完成了作业。
    It _______ me two hours to _______ my homework yesterday.
2. 你不应用筷子指人。
     You shouldn't _______ _______ anyone with your chopsticks.
3. 他努力学习，以便能够赶上其他同学。
    He works hard so that he can _______ _______ with other students.
4. 你应该见面说“好”。
    You are_______ _______say hello when you meet.
5. 无论这项任务有多么困难，我们都会按时完成。
    No matter _______ _______ the task is, we'll finish it on time.