My parents have always made me ________ about myself, even when I was twelve.
She set off at 9 a.m. and ____ the airport an hour later.
If ____ in, viruses can result in illness or even death.
By the 1920s, Howard Carter ____ an explorer.
Three mountains, Meili, Baimang and Haba, _____ are covered with snow, tower over the land.
Is _______ three hours _______ the poor boy to come to school on foot?