It is common practice now ________ the web for resources and information for homework.

It is about time that such practices ______.A．are endedB．be endedC．were endedD．must be end

It is a common theme in many science fiction stories that the world may one day be ______

It is now widely accepted that averting serious climate change is technically ______ and e

It is time that such practices ____.A、are endedB、be endedC、were endedD、must be ended

______（任何计划好了的事)is sure to change as one puts it into practice. （whatever)

According to the passage it is commonly believed that brain differences are caused by_____