If you are lazy in writing an article don't try these!!
STEP 1 Go to articlesbase.com
STEP 2 Create a free account
STEP 3 Writing atleast two good articles that will be approved by the site moderators
STEP 4 Wait for atleast 24hrs for you articles to be approved. If they don't get approved you don't get the coupon
STEP 5 After 24 hrs if approved, login to your articles base account and go to Authors Home and you will get a free adwords coupon if your articles were approved
STEP 6 Create a new adwords account and opt for the manual payment then insert your code.
STEP 7 you are done.