The Yellow River is the second _________ river in our country.
There is _____ “u” and _____ “r” in the word “your”.
Don’t throw plastic bags towards the animals in the zoo.
---Is that Mr Smith?---It __________ be him. He is in New York on business these days.
The boy looked __________ because he didn’t pass his maths test.
---When will Uncle Sam come to see us?---He’ll see us this weekend. He _________ me by email.