Whether ways will be found to stop pollution or not is just___________ worries the public.
| A．why | B．which | C．that | D．what |
_______you worked late yesterday, you need ’t have come this morning.
| A．Unless | B．Though | C．Once | D．As |
This book teaches us how to analyze _______is causing the stress in our lift.
| A．what | B．when | C．why | D．How |
Martin drove along for more than one hour _____he found a convenient parking place.
| A．after | B．once | C．until | D．Since |
—The party will start at 7:00 sharp. Come earlier!
—_______. Thanks for your mention.
| A．Good idea | B．I will | C．I think so | D．You’re right |
The place he suggested to us ______ the meeting is a five-star hotel.
| A．holding | B．to hold | C．hold | D．should hold |