Betty arrived _____London _____ the evening of June 1st.A.at

Betty arrived _____London _____ the evening of June 1st.A.at,in B.at,on C.in ,in D.in ,on
麻烦讲解一下这几道选择题考的什么语法,选哪个,并说明一下理由,
Betty arrived _____London _____ the evening of June 1st.
A.at,in B.at,on C.in ,in D.in ,on
——Do you ofen see William _____on the playground?
-----No,but he is often seen_____Chinese Kongfu in the park.
A.run,play B.run,to play C.running,play D.running,to play
If so,you probably need help ___the bigger choices in your life,like what to do when you are older.
A.make B.to make C.made D.making
They told about lots of defferences between children's lives in cities and _______in villages.
A.ones B that C.those D.them