Which of the following can we NOT see at the Olympic Games?
I think he will come back ______ three days.
We will use ______ and get ______ on the Internet.
---What is Mr Zhang doing?---He is writing some English words ______ the blackboard ______ chalk.
---Tom , how long could I this English novel?---Only one week, because it’s my sister’s.
Mingming is a stay-at-home children, he lives alone, he often feels .