1.   This is a major achievement because, in relative terms, planets are very small and old not emit light.

2.   Finding planets is proving hard enough, but finding life on them will prove infinitely more difficult.

3.   Finding styrofoam containers proved daunting.

4.   Finding them could prove difficult in the mountainous region separating Laos and Vietnam.

5.   So far, finding those has proved almost impossible for the CIA.

6.   Even finding a running mate proved difficult.

7.   Not surprisingly, finding a job proved difficult after that.