Frank has decided to join/joining an environmental organisation. volunteers from the area are spending this weekend to clean/cleaning up the local beach. people should use/to use eco-friendly cleaning products, which are safer for the environment . dan avoids buyng/to buy anything that cannot be recucled later. i'll never forget taking/to take part in a rescue mission for the first time. brian was looking forward to starting/to start his new job at the animal shelter.