Although these questions are very ________， many students can't work them out.
A.simple B.strange C.difficult D.real
(2018张家口二模)We all should make an effort to ________the environment so that we can live in a green world.
A.protect B.regret C.clear D.hide
(2018保定清苑区一模)When playing sports, we should keep safe and ________ hurting ourselves.
A.keep B.avoid C.forget D.consider
(2018泰州改编)It's not surprising that Simon failed the exam again. Computer games________ too much of his time.
A.take in B.take on C.take off D.take up
In every ________ there has to be some give-and-take.
A.friendship B.instrument C.attention D.blackboard
In fact, pandas have become so popular that they are now a ______of China.
A. subject B. symbol C. sign D. spirit
