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

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

______________ you study, you will pass all your exams. AS LONG AS / UNLESS

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

Some politicians are so __________! DISHONEST / UNHONEST

New forms of space travel may .... in the next few years. BE INVENTED or INVENT

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

I wonder if a colony will ...... on Mars in the future. ESTABLISH or BE ESTABLISHED

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

We'll never find life on other planets ... we look for it. UNLESS or IN CASE

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

Spacecrafts in the future will ...... to travel very long distances. DESIGN or BE DESIGNED

We'll be glad to go to your party _____________ we can find a babysitter. PROVIDED THAT / UNLESS