I suggest he ＿＿ leave at once.

We __________ so tired. We've only been to a party.

If  we ___________some measures, we might have prevented the environmental pollution．

Don't handle the vase as if it ______ made of steel.

If Lu Xun were a contemporary writer, I can’t guarantee that he ________ laughed at by readers, as most young people don’t appreciate his writing style.