单项选择题 If you keep your house green, you avoid the()of many dangerous dilease.A、 riskB、 taskC、 chance

单项选择题 Placing a job advertisement on an online job board is().A、 expensivelyB、 costlyC、 cost

单项选择题 Would you like to go to attend the conference on global warming with me? (). but I should finish my homework first.A、 It’s hard to sayB、 You’re welcomeC、 I’d love to