4.The inside of an industrial designer's sketchbook usually looks like some kind of flattened madScientists’laboratories, ______ with doodles of various types of products.
A. filling
B. to be filled
C. which filled
D. filled
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5. The cost of production is _____we are thinking about right now.
A. what
B. that
C. why
D. where
6.Thus repeated handling and ______can be avoided, which is an advantage of transport by road.
A. transplant
B. transmission
C. transportation
D. transshipment
7. The reason people trade, regardless of where they live, is that they believe they will be____ by trading.
A. better on
B. better off
C. better out
D. better up
8. It is important to note that both the lawyer and the legal assistant ____ from specialization andtrade.
A. would benefit
B. could benefit
C. (should) benefit
D. would have benefited