A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
If you cheat in the exam, you could hardly _________ it.
He sat at the desk, __________ a novel.
Mary __________ the job he offered to her, but she didn’t.
— It was careless of you to have left the house without turning off the gas. — My god! _______.
It looks _______ you are ill. You should go to see the doctor.