New ways have to be found to _______of waste materials and poisonous gases so that we can have cleaner surroundings[ ]

－I like thispair of trousers a lot. Can I ________ －Yes, ofcourse,

Your article is too long. You must_____ to about 3,000words.[ ]

My mother _______ us stories when I was young.—How interesting!

They became friends again that dayUntil then, they _______ to each other for nearly two years