--Are you sure to help me find____________ bed for my new house?

--Of course, but not now. I'm heading, for____________ bed and a good sleep.

A. a, a          B. a, 不填         C. the, a        D. a, the

People develop _______ preference for a particular style of learning at _______ early age and these preferences affect learning.

A. a; an                         B. a; 不填                 C. 不填; the            D. the; an

In face of     failure, it is the most important to keep up        good state of mind.

A．不填, a           B．a, 不填           C．the, a             D．不填, the

The naughty boys would play ______trick on ______ neighbours who didn’t give them any sweets on Halloween.

People develop ______ preference for a particular style of learning at ______ early age and these preferences affect learning.

A. a; an             B. a; 不填               C. 不填; the            D. the; an