—Hi,Jack!Did you go to Lucy’s birthday party?—No,I felt so sad.I________then.
---I hope you _______ my party next weekend? --- OK, I _______ .
I was doing my homework _______ mother was cooking.
No one knows what _______ in fifty years.
If there aretrees, the air in our city will becleaner.
What _______ to her yesterday evening?