Those books were _______ adults, so it’s unnecessary for teenagers to digest them carefully.
| A．devoted to | B．intended for | C．connected with | D．introduced to |
He had just sent an email to his pal on the Internet ________ the system broke down.
| A．while | B．when | C．after | D．since |
While intelligent people can often ______ the complex, a fool is more likely to complicate the simple.
| A．sacrifice | B．substitute | C．simplify | D．survive |
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 |
Mary worked here as a ______ secretary and ended up getting a full-time job with the company.
| A．pessimistic | B．temporary | C．previous | D．cautious |
I have received an offer from a German university, but I’m still hesitating ______ I should accept it.
| A．how | B．why | C．that | D．whether |