He was reading his book, completely _______ to the world.
–Guess what, we’ve got our visas for a short-term visit to the UK this summer.--How nice! You a different culture then.
We've just moved into a bigger house and there's a lot to do. Let'sit.
Teachers recommend parents their children under 12 to ride bicycles to school for safety.
Every year a flood of farmers arrive in Shenzhen for the money-making jobs they before leaving their hometowns.
More and more high-rise buildings have been built in big cities space.