—You look worried. What's your________?—I have trouble learning English.
You look _____. What's up, sir?- I can't find my ticket, but it's time to check in.
How was your climbing Mount Huang?---I didn’t believe I could do it __________I got to the top.
--- What is your teacher strict you in class? --- Our habits.
Do you know ______ Zunyi or not tomorrow?
Work harder, _______ you will get more grades in the coming exam.