_________, the subject belongs to biology.

Although the new road is being used, it has not yet been _______opened.

 — Harry is too thin for his age.— So he is, but ______ he is very healthy.

Because of the rise of sea level, some islands will disappear. _____ people of certain countries will have to look for new places to live.

一 I’d like to go home now． 一 Why not stay here for the night? It is so late now.___,it is raining．