_________ pleased me was that there was my purse, in the back seat of the taxi, _____ the driver couldn’ t possibly see it before. 

I have heard a lot good things about you _______ I came back from abroad. 

It’s not necessary to explain the truth________ there are air, water and sunlight , there are living things.

You can only be sure of_____you have at present;you cannot be sure of something you might get in the future.

Stephen Hawking has expressed his opinion   ___ humans might one day be able to make spaceships capable of such speeds that time on board would slow down．