There’s a rising problem with the popularity of private cars _____road conditions need _____. [ ]

Who should be responsible for the accident?—The boss, not the workers. They just carried out the order_____.[ ]

____ has been proved again and again that ____ is said in the ads greatly affects people’s impression of the products.

Who did the teacher have ___ an article for thewall newspaper just now

____________we had at Disneyland!