He came running along and climbed ____ the train just as it was about to leave.
Among the crises that face humansthe lack of natural resources.
An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
at the photos, illustrations, title and headings and you can guess what the reading is about.
I cannot hear the professor clearly as there is too much noise ________ I am sitting.
Sophia got an e-mail ________ her credit card account number.