Berners-lee made ____possible for everyone to use the Internet.

 He didn’t make ____ clear when and where the meeting would be held.

I don’t quite understand what you said. Would you please give us ______example?

Clothing made of man-made fibers has certain advantages over _____ made of natural fibers like cotton, wool or silk.

--- You know Brad Pitt is already fifty． --- You are kidding．He doesn’t look __________ ．