【C17】A．In factB．ContrarilyC．LuckilyD．Naturally

Farmers use water in many ways.（) they use water to grow crops.A.In factB.For exampleC.B

【C17】A．upB．downC．aroundD．in

【C17】A．onB．ofC．atD．in

【C17】A．WhenB．HoweverC．AlthoughD．In case

【C17】A．downB．outC．overD．in

【C6】A．In factB．In additionC．In generalD．In theory