Jawaban:

1. We should use the stair because the elevator is being repaired
2. Andi doesn't bring his homework, that is why he is scolded by the teacher.
3. The room is still hot. I think the air conditioner needs to be repaired.
4. The population of Sumatran elephant should be preserved to keep their existence in wild nature.
5. Don't ever take someone else's stuff before being permitted.
6. That is a very old building. I was not even born yet when it was built.
7. Andi : 'What time will the delayed plane depart?'
   Badul : 'They say that it will be announced soon'
8. Anita is looking forward to her birthday because she has been promised a new watch.
9. I am very hungry and I want to eat, The meal has been cooked by my mother.
10. I like reading novel very much. Some novels have been bought just now.

Penjelasan:

(Ini bukan arti persis dari jawaban diatas, hanya bagaimana saya bisa menjawab pertanyaan)
1. Mereka harus menggunakan tangga karena elevatornya sedang diperbaiki.
2. Andi tidak membawa pekerjaan rumahnya, karena itu dia dimarahi gurunya.
3. Ruangannya masih panas, mungkin ACnya perlu diperbaiki.
4. Populasi gajah sumatra seharusnya di awetkan agar keberadaan mereka di alam sana masih ada.
5. Jangan pernah mengambil barang orang sebelum di ijinkan.
6. Bangunan ini sangat tua, aku saja belum lahir ketika bangunan ini dibangun.
7. Andi bertanya "Jam berapa pesawat yang telat akan mendarat" dan Badul menjawab "Mereka akan mengumumkannya nanti"
8. Anita menantikan ulang tahunnya karena dia dijanjikan sebuah jam tangan baru.
9. Aku sangat lapar dan aku ingin makan, Makannya sudah dimasak oleh ibuku.
10. Aku suka membaca novel, beberapa novel baru saja dibeli.