It is high time that you____(change) the plan as it is really infeasible.
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Obviously, the serious accident resulted from his ___(care) driving
As is known to all, smoking is _____(harm) to our health and you should give it up
When giving aspeech, you should speak oludly to make yourself____(understand)
I can _____(sure)tell you that if you continue like this , you will eventually fail.