A small program which can be used to send and receive back your gifts.
After downloading and installing the program, open it and choose everything under Farmvillle and click on Start above.
This application / software will accept all your pending gifts and will send them back.
If you use Chrome and not willing to download the above software. You can just add a simple extension to your chrome.
Facebook Games Simplifier - Version: 3.8.4
(Functionalities are same, either you use the software or the extension in Chrome)