1. I have decided ________ (study) engineering.
答案：to study
2. Would you mind ________ (open) the door?
答案：opening
3. I suggest ________(go) to Europe for a visit next summer vacation.
答案：going
4. She tried ________ (wash) her hair with a new shampoo.
答案：washing
5. When I left home, I had forgotten ________ (bring) it with me.
答案：to bring
