there be句型的过去式 — 英语填空题
题目
按提示用 there be 句型的过去式（was/were）完成句子：Last year, ___ (there be) only one small tree near the river. But now there are many trees. Ten years ago, ___ (there be) a lot of clean rivers in our city, but some of them became dirty. Once, ___ (there be) any plastic bags on the beach? No, there weren't.