请帮我解析几道题如题

请帮我解析几道题如题
( ) 4.Have you seen such big ________?A.a tomato B.tomato C.tomatoes D.tomatos 26.–You needn’t wait for Tom any longer.He must be having supper at ________.A.the Tell’s B.the Tells’ C.the Tells D.Tells 30.In western countries,________ are thrown away each day.A.mountains of rubbish B.mountains of rubbishes C.a lot of rubbish D.a lot of rubbishes 31.He is trying to explain how ________ began on the earth.A.life B.lives C.the life D.a life 28.At the age of eight,Mary joined a group of ________.A.children dancers B.child dancers C.child dancer D.children’s dancers