As a young man, Comrade Zhou Enlai ________ the students' movements and later ________ the Communist Party of China.
He began to take political science _______ only when he left school.
It took a long time for the connection between body temperature and illness ________.
-- Are you going to have a holiday this year? -- I’d love to. I can’t wait to leave this place ________.
-- I’m sorry I’m late. I got held up in the traffic on my way here. -- ________ .
Tony is ______ the guidebook, looking for information about Japan, where he will travel soon.