Always ________ in mind that your main task is to get this company running smoothly.
A.to keep B.to have kept
C.keep D.have kept
________ makes the book so extraordinary is the creative imagination of the writer.
A. That B. What
C. Who D. Which
From space, the earth looks blue. This is ________ about seventy－one percent of its surface is covered by water.
A．why B．how
C．because D．whether
It's good to know ________ the dogs will be well cared for while we're away.
A. what B. whose
C. which D. that
Do not let any failures discourage you, for you can never tell ________ close you may be to victory.
A. how B. that
C. which D. where
________struck me most in the movie was the father's deep love for his son.
A．That B．It
C．What D．Which
