The best way to explore _______ countryside is on _______foot.
The teacher is so kind to us that we all ___ him as our good friend.Which of the following is not suitable?
I have warned him of the danger ___ but he always turns deaf to my warning every time.
He has ___ the company ___ the post for three times, but he has been ___ three times.
She squeezed the water ___ her wet clothes.
Can’t you think that a dictionary is an important ___ in learning a second language?