In my three years with the city schools, I’ve seen a teacher with 10 years of experiencebecome convinced, after just a few observations, ________ he was a terrible teacher.
The poet andpianist is going to give us a talk this afternoon.
We can never expect ____ bluer sky unless we create _____less polluted world.
Would you like tea or coffee? --_____, thank you. I’ve just had some water.
In that school, English is compulsory for all students, but French and Russian are ______.
Sometimes proper answers are not far to seek ______ food safety problems.