Thank you for giving up your coffee break to help. I know you always need _________after three classes.
35. I like getting up very early in summer. The morning air is so good _______.
34. People in China are proud of _____ we have achieved in the past ten years.
33. Walking through the park, _____.
32. ---Why on earth didn’t you answer the phone? ---I’m sorry, but the doorbell _____ too.
31. _____ our earth, otherwise it will be no longer fit for us to live on.