I'msorryIforgottowrite;Ihadsomuchelse________mymind.
Itisusefultoscience_______theearthasanobjectinspace.
Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.
________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
Theboyranoutoftheclassroomwithouttheteacher's_______.