The girl _____yellow is her sister.
Its population is almost ________ of the world’s population.
At eight o’clock last night Alice _________ with her family happily in Hongkong.
John does important research _______ the best ways to help the old.
Many wild animals don’t have a safe place to live, ___________people are taking away their land and forests.
We stayed there and watched the opera ______ an hour.