In modern times,people have to learn to ________ all kinds of pressure although they are leading a comfortable life.
To be honest, I would rathermy dog out, which made so many troubles.
Jack is late again. It isof him to keep others waiting.
Jack, who pretended, heard, however, every word that was said.
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.