核心语法项目整合 — 英语填空题
题目
用所给词的适当形式填空，补全短文。
Last Sunday, I 1.___ (visit) my grandpa's farm with my family. There 2.___ (be) many horses and sheep on the farm. It was so dirty at first, so Dad said, "We 3.___ (should) throw rubbish everywhere." Next weekend, we 4.___ (be going to) plant some trees there again.