When my grandfather retired(退休) at the age of 60, he took a sea ________ around the world, which had been his dream since his childhood.
--- Albert, I have a favor to ask you. --- _______.
“The moment ______ soon,” he thought to himself, waiting nervously.
______ nearly all behavior is learned behavior is a basic assumption ______ has been put forward by the social scientists.
He is very ______ and well-qualified, so he should reach the top of his profession.
______ nobody else at hand, I had to carry the heavy box to the eighth floor by myself.