This ship set sail and gradually disappeared where the sea ________ the sky.
She owes her success________good luck more than ________ability.
He was in poor health,so the doctor________him to drink wine.
—You see,I’m poor in maths,you are not good at English,and...—That’s________we should help each other.
______I am concerned,the price of the computer is much too high,so I can’t afford it.
Teachers recommend parents_____their children under 12 to ride bicycles to school for safety.