_______ at all is worth doing well.
A. Whatever is worth doing
B. That is worth doing
C. What is worth doing it
D. Whatever is worth doing it
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They built a highway _______ the mountains.
A. lead into
B. to lead into
C. led into
D. leading into
The challenge is not one of expansion. _______, the rapid growth in enrollment over the last 40 years has come to an end.
As a result
By all means
C. In contrast
D. On the contrary
PC机的硬件系统主要由主机、内存储器、外存储器、__输入设备___和_____组成