——Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to do it.
My father often ________ Beijing for Shanghai.
— It’s _______, Dad. Can I watch TV for half an hour? — OK.
There is no ________ over (在……上方) the river. We need to cross it by boat.
This question is very difficult __________ I ask my brother for help.
Anna _________ gets up at 6:40 a.m., but she gets up at 7:30 a.m. today.