她是真的难过，还是只是在装模作样？

Was she really upset or was that just an ___act?

对游客的友好欢迎常常只是装出来的。

The friendly welcome for tourists is often just an ___act.

他保持着冷静的伪装来隐藏自己的焦虑。

He maintained a calm ___act to conceal his anxiety.