根据中文提示将下列句子补充完整。
(1)他们正在讨论他们的周末计划。
They are talking about _________ _____________ _________ the weekends.
(2)你和你姐姐个子一样高吗?
_______ you as _______ as your sister?
(3)我将要去超市为我父母买礼物。
I’ll go to the _____________ to buy some ___________ for my ___________ .
(4)我父亲正在他的书房里写信。
My father _______ ________ _______ _________ in his study .