It’s polite of you         (thank) others for their help and support.
In order to join Oxfam Trailwalker, they          (train) themselves two months ago.
I          (design) the home page for my class when my friend called me last night.
Amy’s father         (be) away for three months. He will be back in a week.
We are confident that the environment          (improve) with our efforts in the future.