_______ in my life impressed me so deeply as my first visit to Tibet.
He behaved _____ nothing had happened.
I'd like to buy a house-modern, comfortable, and _____,in a quiet neighborhood.
The elderly need special care in winter, as they are _____ to the sudden changes of weather.
As students, we should devote ourselves _____ our study.
Seeing a _____ smile on his face, no one doubtsthat he will get through the driving test.