（题文）（2018·江苏）By boat is the only way to get here, which is _______ we arrived.
A. where B. when
C. why D. how
（2018·江苏）Self-driving is an area _______ China and the rest of the world are on the same starting line.
A. that B. where
C. which D. when
The factory used 65 percent of the raw materials, the rest of which ________ saved for other purposes.
A. is B. are C. was D. were
Stephen Hawking believes that the earth is unlikely to be the only planet life has developed gradually.
A. that B. where
C. which D. whose
The companies are working together to create ________ they hope will be the best means of transport in the 21stcentury.
A. which B. that C. what D. who
______ the cold, thin air and low oxygen levels also can cause mountain sickness.
A. Regardless of B. Apart from C. In addition D. Except for
