The _______ Prime Minister expressed hissatisfaction with his talks, _______ that he hadenjoyed his stay here.

I was lucky enough to get on the train before it ________.

I will try my best to stop my son from _____ the same mistake.

The loss has not yet been _____accurately, but it is believed to be well beyond a hundred million dollars. [ ]

The fact has worried many scientists _____ the earth is becoming warmer and warmer these years. [ ]