The university estimates that living expenses for international students ________ around $8,450 a year, which ________ a burden for some of them.
The passenger was tired and walked slowly but he got home____.
A booking-office is a place _______ tickets are sold.
This is the reason _______ he was absent.
Listening to loud music at rock concerts ____ caused hearing loss in some teenagers.
______ the task is difficult, they managed to complete it on time.