—Is Jissica a diligent student ?—No , but she is a lazy one , if .
Only when _______________ home ____________ the truth.
_______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 .