One works hard with a high purpose and not just to show______.A．inB．offC．overD．up

_____uses one or two high pressure pumps for all the cylinders with one more____ standby, while______have a separate high－pressure pump for each cylinder.

听力原文：W: Were you hard－working when you were in high school, David？M: Yes, I studied ha

听力原文：M: How are you doing with your plan？W: No one knows how to do the work correctly,

One of the problems with multiple authorship is that it is hard ______A．to allocate the re

Success favors one who is ready for it and calls for years of hard work, The underlined pa

Why is the man impatient when working with a large group？A．Because it"s hard to get along