---Have you heard of the Zhengzhou-Xi’an passenger Dedicated Line ___ can shorten 5 hours’ travel time between the two cities ?---Of course .A. where B. when C which D. who
— ______ go to the theatre together with me? — Good idea!
–– When did they arrive? –– They ______two hours ago .They ______ here for two hours .
----It’s important_____ a foreign language. ----I agree with you. We should study hard.
I ______ to think their jobs were ______ .
The maths problem is ______ hard for us ______ solve.