We have a high regard for Mr. Black because he always tries to ________ his principles.
---Where did you buy the T-shirt? ---It was in the shopping mall _____ my mother works.
_____ with fear, the boy stood still to avoid _______.
Tom always feels it necessary that he ________English.
On our arrival, we found Tom _____at the desk and ______a letter.
The boy is often found _____in reading books.