Where is your mother， Jack—She is busy ____ a cake. I will have a birthday party tonight.

TV was invented in _________ century.— Is that true

When such an organised group became toolarge for its members to travel together comfortably, it would ______.

_____achievement, last week’s ministerial meeting of the WTO here earned a low though not failing grade[ ]

When __________ why he was late again, Jack didn’t say anything.