Stir-fried Chicken and Mushrooms

This is one of my mother's creations on the menu of my family restaurant. It was so well received by our customers that I now make this dish frequently in my home because it is so delicious and brings back past sweet memories.
Ingredients:
1/2 lb. chicken breasts
2 tbs canola oil
Marinade:
1 tsp oil
1/4 tsp salt
2 tsp cornstarch
2 tsp cooking wine
Vegetables:
1 1/2 cups button mushrooms, quartered
1/2 cup celery, sliced diagonally
1/4 cup white onions, sliced
Cooking liquid:
1/2 cup chicken stock
1 tsp cornstarch
1 tsp cooking wine
1/2 tsp sugar
1 tsp soy sauce
Garnish:
3 green onions cut into 1 inch long pieces

Directions:
Slice chicken into bite size pieces and mix with the marinade. Let chicken marinate for 30 minutes. Heat oil in a large wok. Stir-fry chicken until the meat turns opaque. Remove chicken. In the same wok, stir-fry white onions until fragrant. Add mushrooms and celery. Stir-fry briefly, about 5minutes. Add cooking liquid and return chicken back into wok. Bring to boil and add green onions. Remove and serve.