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 .