_ _ busy schoolwork, the children also have to take arts, music and sports classes in their free time.
Mr. Black________ Shanghai in a few days. Do you know when the earliest plane ________on Sunday?
Rather than ________ on a crowded bus,he always prefers ________ a bicycle.
Like some of my classmates,I cannot live up to my teachers' expectations;________,I let them down.
We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
Equipped with modern facilities,today's hospitals are quite different from __________ of the past.