I have waited for the bus for twenty minutes.(对画线部分提问)________ ________ have you waited for the bus?
--- The exam was very easy, wasn’t it? --- Yes, but I don’t think _______ could pass it.
Be _______. Make sure not to make the same spelling mistake next time.
I heard him _______ the piano in the next room at 10:00 last night.
- Do you know some butterflies taste with their feet? - _______ I can't believe it.
It was difficult for me to _______ this morning because I slept too late last night.