Ever since the food safety accident, the company has carried out _______ checks on milk products to make sure that they are of high quality..
Was it in the village __________ he was born __________ the talented journalist met the retired professor?
It wasn't until nearly a month later __________ I received the manager's reply.
It was __________ he came back from school today __________ he found his new book missing.
It was only when I reread his poem recently __________ to appreciate its beauty.
__________ you met the foreigner from Canada?