--The river used to be clean. How does it become dirty? -- There are many factories ________ waste water into it. A. pouring B. pour C. poured
—Who broke the window yesterday? — ______ Jack ______ Mike. It was Jim.
---Did your father buy a gift for you on your birthday? ---No. I got some gifts that day. They_____________by my aunt and uncle.
.I’ll never forget the mountain_______I climbed with my dad last year.
--Is that your dog? ---No.That is Peter’s dog. The brown one is________.
.Mr Wang has an idea about our school trip. It sounds_________. We want to try.