Cook linguine according to package directions for al dente. Meanwhile, in a small saucepan, cook garlic in 1 teaspoon oil for 1 minute. Whisk in stock, soy sauce, sugar, oyster sauce, lime juice and chili sauce; bring to a boil. Reduce heat; simmer for 1 minute., In a small bowl, combine cornstarch and water until smooth. Stir into pan. Bring to a boil; cook and stir 1-2 minutes or until thickened. Remove from heat., In a large skillet or wok, stir-fry vegetables in remaining oil for 4-6 minutes or until crisp-tender. Stir in chicken and sauce; heat through. Drain linguine; toss with chicken mixture. Top with green onions, if desired.