My friend Li Xiao knows myhometown very well because he _______ there many times with me.

David _____ a customer when the fire started．

We’d better take umbrellas—I’m sure it_____ when we arrive in London; it’s always wet there at this time of year

Many crimes are committed by some badpeople， an example of which is fraud， a crime money is stolen by cheating others.

It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses inlatter life.[ ]