①What we find out from space research is important for us on Earth.
②It's wellknown that the ancient Chinese invented the rocket.
③We think it probable that he is dead.
④The teacher showed us the controls of the spacecraft and explained how gravity worked.
⑤They insisted that everyone (should) come to the party.
⑥The proposal that we (should) import more equipment from abroad is to be discussed at the meeting.
⑦I have no idea when she will be back.
⑧The question remains whether they will be able to help us.
⑨The problem is who we can get to replace her.
