A woman in her 60s gave birth to two test tube babies three years ago, after her only daughter died of gas poisoning.
Children in that kindergarten are sometimes asked to sit on their hands __________ listening to the teacher.
-What about the result of your final examination? -Not so bad. Not so good as my parents expected,__________.
__________ the Internet is of great help, I don't think it's a good idea to spend too much time on it.
I was working as a waiter last month,__________ my friends were lying on the beach.
-When did the computer crash? -This morning, while I __________ the reading materials downloaded from some websites.