________ seems to be a strong competition in China for senior high students to enter college or university.
Scientists think that the continents _______ always where they ___today.
--- Would you tell me ______ you want your tea with sugar or milk?--- Sugar, please.
--- Would you tell me ______ you want your tea, with sugar or milk?--- Sugar, please.
Leaves are found on all kinds of trees, but they differ greatly _______ size and shape.
He began to take political science only when he left school.