There were some chairs left over____everyone had sat down.

Experts are trying to work out a plan to deal with the problems caused by global warming________it is too late.[ ]

pplicants stood outside themanager’s office, nervously waiting ________ for thejob

What a pity! ________joined in the party, I would have met my old friend．

Astronomers have discovered that three planets have sizes and temperatures similar to _______ of Earth.