---Who do you think should ____ the responsibility for white pollution? --- Both the producer and the consumer.
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.
----Sunny said you were crazy about basketball, really? ----Yes. And that’s why I join the volunteers for the Olympic Games and I really _______volunteering.