--John has put forward_______most challenging question for us to answer. --Yes, it really is. I have never heard_____ harder one.
—You seem to be familiar with London. —I ______ there for three years. It’s great to be back.
Children ______ to difficult situations are better at handling those _____ tasks.
The plan _____ just because people were unwilling to cooperate.
—It is burning hot today, isn’t it? —Yes. _______ yesterday.
______ houses were knocked in the earthquake.