在这个城市，交通堵塞很常见。

Traffic jams are ___common in this city.

数学是我们班的共同兴趣。

Math is the ___common interest in our class.

这位医生对待所有病人都一视同仁，无论是富人还是普通人。

The doctor treats all patients equally, whether they're wealthy or just ___common people.

他那粗俗的笑话让在场所有人都感到尴尬。

His ___common jokes made everyone at the party feel uncomfortable.