Rock music ______ sound popular with the young，but it's not the favor of the aged people．（ ）
A．mustB．needC．shouldD．may
A robot served us dinner last night． Don't you think we are living in amazing times？
I can't agree more． The ______ makes our lives easier and happier．（ ）
A．informationB．technology
C．discoveryD．competition
They offered courses _________ students know the importance of protecting the Huanghe River．（ ）
A．helpB．helpedC．helpsD．to help
Compared with a 1﹣day weekend， a 2﹣day weekend is ____ as we may have enough time for our hobbies．（ ）
A．more pleasantB．less pleasant
C．the most pleasantD．the least pleasant
As soon as books ______， the volunteers posted them to the students in Hope Primary School．（ ）
A．are raisedB．were raised
C．raisedD．have raised
The children are jumping excitedly because they have _______ the design perfectly in groups．（ ）
A．completedB．controlledC．contactedD．caused