Our enemy bills have been increasing steadilythese costs，our telephone costs have doubled over the past six months

The Mekong River Commission has found no evidence______ the dams on the upper reaches have an influence on the water flowdownstream

It is said that some software on learning subjects for pupils _______ in a very practical way. [ ]

For environmental reasons，we aswell take these waste products and have them recycled.

Are there tomatoes at home，Mama–No，there aren’t But there are ________ carrots．