This problem may lead to more serious ones if ________ unsolved.
On the mountain _______ and in the temple_______.
---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.