Berners-Lee ________ the idea of the World Wide Web in 1989 while working in Switzerland.
His luggage includes two large cases which ________ as much as 50kg.
-Why didn’t you go to the party ?_______ an invitation, I would have gone to the party .
_______ I admit that the problems are difficult , I don’t agree that they can’t be solved .
There are fifty students in our class, ______ are girls .
A poet and journalist ________to give us a speech tomorrow in our school .