___________ we should do to protect wildlife?
—— Have you found the bike you lost yesterday? —— Yes, I've found ________ already.
________by the advances in technology, many farmers have set up wind farms on their land.
He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.
Is this the place_____ John was born?
The suggestion ________ by the teacher is available.