Itisusefultoscience_______theearthasanobjectinspace.
A、toconsiderHethoroughlyunderstoodthesociety__________.
Forthenewcountrytosurvive,________foritspeopletoenjoyprosperity,neweconomicpolicieswillberequired.
Theboyranoutoftheclassroomwithouttheteacher's_______.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
Theterriblenoiseis______memad.
