I'm optimistic about finding extraterrestrial life, ... we continue to invest on exploration. PROVIDED THAT or UNLESS

Some politicians are so __________! DISHONEST / UNHONEST

Sending a crew to Mars is possible ... we can keep them safe. AS LONG AS or IN CASE

We won't discover what's out there ... we don't continue to explore. UNLESS or IF

Unfortunately, the ___________ of Amazonia has been happening at a fast pace. DEFORESTATION / DEFLORESTATION

NASA may ... a spacecraft to explore Pluto. SEND or BE SENT

I'm sorry, but I completely _______ with what you said. DISAGREE / AGREE

Travelling to Europe is _________ for me now. I am totally broke. INACCESSIBLE / UNACCESSIBLE

Everybody can come to the party ________ they bring some food. WHEN / PROVIDED THAT

None of them can read or write. They are all _______________. ILLITERATE / ALPHABETIZED

____________ you study, you will not succeed. UNLESS / IN CASE

I don't believe life ...... discovered on other planets in the near future. WILL BE or HAS BEEN

They won't show you the exams papers, _________ you ask to see them. PROVIDED THAT / UNLESS