When the weather is fine, watching Korean TV plays or playing computer games all day at home is not a(n) _____ way to spend your free time.
The old man __________ in Tibet for two years as a volunteer teacher;it is an experience he often mentions.
Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
Thosethe exam cheat mustanother exam tomorrow afternoon.
He admitteda lie in order to avoid.
I your success although you are in difficulty now.