Asynchronous HTTP calls grequests

I've always used the requests library. But if my memory serves me right, you can only send requests to 1 http url at a time, and then to another one, sequentially. Grequests, as it's written, can send requests to up to 10 URLs simultaneously, meaning asynchronously. But I don't know how to do it, I've already tried. The file has about 150 URLs. Code:

import grequestssimplesite = 'http://shost-craft.su'with open(""C:\\\\cruelnetwork\\\\cruel.need\\\\wolfs.txt"") as werewolves:        array = [row.strip()+simplesite for row in werewolves]params = {'a'