At the opening_ _of the school, our headmaster gave a short speech.
A new technique ____ out, the yields (收成) increased by 20% .
There are many inconveniences (不方便) that have to be ____ when you are camping.
The size of the audience, ____ we had expected, was well over one thousand.
Very few experts have ____ with complete new answers to the world s economic problems.
A table made of steel costs more than ____ made of wood.