Walking alone in the dark,the boy whistled to ________ his courage.
--- I was trying to repair that stupid machine, but I failed. --- Well, you_______.
---What are you busy with ? --- We are carrying out a research _______ the causes of cancer.
---I hear there will be ______ talk on English study tomorrow morning. ---Do you mean ______ speech our teacher asked us to listen to?
After I returned to my hometown, I was pleased to find that it had a new look.
Can you share a book with him?We’ll let you have a new one next Monday.