I still remember ____ it was, he told me, ____ I could solve this kind of problems.
—Waiter! — —I can’t eat this. It’s too salty.
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 ______.