This toy Mickey Mouse _______be Amy’s. She’s the only kid at the picnic.

Jack, when shall we go to visit Mr. Smith? – It’s up to him. We’ll go to see him whenever _______.

Mr. Green didn’t post the letter _________. He asked his son to do it for him.

I would appreciatevery much if you could send me a few copies of the mechanic design of your new model.

Not until quite recently that language is closely related to culture．