Our research has focused on a drug which is so _____ as to be able to change brain chemistry.
| A．powerful | B．influential | C．monstrous | D．vigorous |
One of the National Health Regulations is that public schools ______ actively create conditions for sports facilities opened to the public.
| A．shall | B．will | C．might | D．could |
Please put away your clothes hanging outside. As you know, dark clouds______ heavy rain.
| A．admit | B．promise | C．present | D．permit |
_______ that your resume works for you, I recommend writing it more like a proposal than a job description.
| A．Ensuring | B．Ensured | C．Having ensured | D．To ensure |
The headmaster was______ as to how to inform her of the news that her daughter failed to pass the exam again.
| A．at ease | B．in relief | C．in a hurry | D．at a loss |
Your sister must be helping the little girl with her homework, _______ ?
| A．needn’t she | B．mustn’t she | C．isn’t she | D．must she |