It’s already 10 o’clock, I wonder how it ____ that she was two hours late on such a short trip.
_______ in her office for nearly 20 hours, she is going home to have a rest.
Tomorrow, our ship will set sail for Macao.
Many people believe we are heading for environmental disaster(灾难) _______we radically(根本地) change the way we live .
It’s a long trip and we’ll have to ___________ early tomorrow morning .
The way you thought of _________ the work is very good .