Jawaban:
A. Revision 1
[1..] You look pale. What's happened?
[2.] I have known her since I was a kid.
[3.] We will be getting married next month.
[4.] I am going to sleep at 10 pm tonight, atau
I am sleeping at 10 pm tonight.
[5.] How long will you be waiting before the doctor is ready to see you?

B. Revision 2
[1.]  We will be traveling to Japan next month. We have already bought the plane tickets and made hotel reservations.
[2.] I am going out with my friends at 4 pm this afternoon, while my sister is having piano lessons.
[3.] What has he done for the past two hours before his mother entered the room?
[4.] Quasars, the faint celestial objects which resemble stars, are perhaps the most distant objects ever known.
[5.] Several million points on the human body register either cold, heat, pain or touch.

Penjelasan:
A. Revision 1
[1]  You look pale = kamu pucat. Harusnya "what's happened?" Karena pucat itu kondisi alami dimana muka berubah warna. Becoming pale is a natural condition of your face where it changes its color.
[2]  I have done this since I did that. Aku udh melakukan ini sejak terselesaikannya sesuatu. I have + (v. trans) 3 + object
[3]  I will be v-ing, itu ditunjukkan untuk mendeskripsikan sesuatu yang akan terjadi di masa depan yg dibayangkan si pembicara.
[4]  I am going to verb, atau i am verb - ing, menjelaskan sesuatu yang pasti terjadi di waktu tertentu (specified time, at 10 pm)
[5]  I will be v-ing, menunjukkan kesediaannya melakukan sesuaut.

B. Revision 2
[1]   I will be v-ing, itu ditunjukkan untuk mendeskripsikan sesuatu yang akan terjadi di masa depan yg dibayangkan si pembicara. Dia akan traveling dan menggambarkan traveling itu di masa depan.
[2]  While, itu digunakan untuk dua continuous actions that happen at the same time. I am (v trans) - ing object, while she is (v trans) - ing object.
[3]  Has done something for (some time) = sudah dilakukan selama (beberapa waktu) before subject + verb2 (sebelum org lain + (tiba-tiba) melakukan sesuatu yang lain). Contoh before mum entered = sebelum ibu tiba2 masuk
[4]  dan [5]  Benda yang (kata kerja). Forms: "Objects which (verb plural)." Verb plural gak pake - s diakhir. Kalau "object which (verb singular)." Verb singular pake -s diakhir. Kayak "objects which resemble" (kalau bendanya lebih dari satu), atau "object which resembles" (kalau bendanya satu aja) Atau "points ___ register" dan " a point ____ registers".

(xcvi)