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1. A lot of water _________ (waste) every year. It’s a serious problem.
2. Now many kinds of work __________ (can do) by robots. (1999ÉϺ£)
3. English __________ (speak) as a second language in some countries. (1999ɽÎ÷)
4. Fish may _____ ____ (catch) in the river. (1999ºôºÍºÆÌØ)