It was when searching for the lost book whose cover was missing ______ a secret letter addressed to his mother.
I had great difficulty ______ the suitable food on the menu in that restaurant.
______ in a famous university is what most students wish for.
______ by his grandparents in the countryside, he isn’t accustomed to ______ in the city.
If the babysitter cannot come tomorrow, do you mind ______ alone at home, doing his homework?
______ to the man’s timely coming, the ______ boy was saved.