You’ve dropped __________ “s” in the word “across”.－Oh, you are right, __________ letter “s” should be doubled like this “cross”.

Give me an undisturbed hour and I ______ the work Tom has left unfinished.

Frank told us ____ funny story, but he forgot ____ ending himself.

They look so tired.–Yeah. They _____________ day and night. So they are all in poor health.

As a result of destroying the forest, ______ of animals ______losing their homes.