Explanation:

According to Einstein's General Theory of Relativity, matter bends the fabric of space and time. The distortion of the space-time continuum even affects the behavior of light.  It implies the existence of black holes—regions of space in which space and time are distorted in such a way that nothing, not even light, can escape.

The bending of light by gravity can lead to the phenomenon of gravitational lensing, in which multiple images of the same distant astronomical object are visible in the sky. So, statement 1 is correct.

The theory also explained that space and time are malleable or flexible, and ever expanding. That basically predicted that our universe was ever expanding.  Therefore statement 2 is correct.

Gravity, according to the theory  is caused by warping of space and time or space-time. Hence, statement 3 is correct.