他声称自己见过外星人，但这显然是假的。

He claimed to have seen aliens, but it was clearly ___false.

他戴了一副假牙，看起来很自然。

He wears a set of ___false teeth that look very natural.

他背叛了我们，证明他是个不忠的朋友。

He betrayed us, proving to be a ___false friend.

抽屉关不紧，因为有一个螺丝松了。

The drawer won't shut properly because one screw is ___loosely fitted.