is recorded in history, silkwormswere first raised by a woman in ______ is today Hebei Province

the Dome, ________ 103-minute documentary released by Chai Jing, has pushed public awareness about air pollution and encouraged people to join in efforts to make ________difference.

Some insects________the colour of their surroundings to protect themselves.

More and more people are signing up for Yoga classes nowadays, ______ advantage of the health and relaxation benefits.[ ]

We usually the moon and share mooncakes with families on Mid-Autumn Day.