.Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest.
I had great difficulty___the suitable food on the menu in that restaurant
Claire had her luggage ___an hour before her plane left
Michael put up a picture of Yao Ming beside the bed to keep himself___of his own dreams
Queen Elizabeth Ⅱis often thought to be the richest woman in the world.___,her personal wealth seems rather small
She has been appointed___manager of the engineering department to take___place of George