--- Cross the road carefully, __________ you’ll keep yourself safe.--- Thank you.
Mr. Green and Mr. King have taught English at Beijing Sunshine Secondary School ________ they came to China two years ago.
--- I must say it is the most delicious duck I have ever eaten.--- __________. I’m glad you enjoyed it.
I will tell him ___________ I see him.
There ________ many changes to Beijing over the past years.
---How many times have you _________ to that place? --- Twice.