Those who have ________ floods and sandstorms know the importance of environmental protection.
—Have you heard that earthquake struck Japan on March 11?—Yes. It came as shock to us.
John told me he’d like to go hiking with me, his voice _______joy.
----What _______ the children be doing?----They _______ be playing a game called Bingo.
It’s required that mineral resources_______ hand in hand with the local environment protection.
Some children were seen _______in the garden all the morning. It must have been _______who picked the flowers.