As is recorded in history, silkworms(蚕)were first raised by a woman in _________ is today Hebei Province.
The study surveyed 500 families and found that the main ________ problem people suffered was tiredness, followed by loneliness and anxiety.
It was with great joy ________ he went to Shanghai to work as a volunteer there.
Tom said that he was late because he ________ in the elevator.
His parents told him ________ too much about what others said.
________ his appearance, he is most probably a new teacher.