1.Knowing a foreign language means better job chances the future.
答案in
2.What he (refer) to in his article is unknown to the general reader.
答案refers
3.This affects the birds’ nervous (system) and ability to produce baby birds.
答案systems
4.This suggests that British attitudes accent have deep roots and are based on class prejudice.
答案to/towards
5.When he left his (nation) country,he said he would not return until he was successful.
答案native
6.People who used horses to pull heavy loads would have chosen (keep) stronger animals.
答案to keep
