Much of his spare time __ learning how to fix radios.
--How long ________ as an assistant here?-- Ever since I finished middle school.
--Forgive me for hurting you by saying so.--________
They had ________ in keeping in touch with each other that they decided to move to the same city.
--Is this the office ________ your parents are working now?--No. They are working in the next one.
About seventy percent of the population in China _______ farmers.