My son has gone abroad. I’m looking forward to him_______.
A. return B. to return C. returning D. returned
It is good manners to eat up _______is left in your plate.
A. that B. what C. which D. all
Can you explain ________ the sun goes down in the west?
A. why is it that B. why it is that C. how it is that D. how is it that
A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
A. it B. that C. which D. whom
--- Has James finished his report on his Enquiry Learning yet?\
---- I’m not sure. He _____ on it last week.
A. was working B. has worked C. worked D. had worked
If you are traveling_ the customs are really foreign to your own，please do as the Romans do.
A. in which B. what C. when D. where
