—We should do what we can ________ the endangered animals.—Yes, it’s our duty_________ them.
I went to his house _________ say sorry to him.
I enjoy playing computer games, but I can'ttoo much timethat
is parents’ jobclean and comfortable environment at home.
________the doctor, the boy was saved.
—When will she go home? —She ______ home ___ she finishes her homework.