The practice of hanging clothes across the street is a common ___ in many parts of the city.

It is very important for English teachers to have a knowledge of the theories of language_______. 

Four years had passed, and I found Mary had＿＿＿＿＿．

Three criminals were caught and asked to aid in the           .

— If you like I can do some shopping for you.— That’s very kind of you for your ______.