The conflict between economic development and environmental protection, if not appropriately _________, can cause disastrous consequences in daily life settings.
——You didn’t wait for Mr. Black last night, did you? ——No, but we ____. He didn’t return home at all.
We should know that we can only reach the top if we are ready to ____ and learn from failure.
As time went by, the plan ____ fairly practical.
I have no one ____ me, for I am a new comer here.
Young as he is, David has gained ____ rich experience in ____ society.