This is the happiest(happy).
The new rules made the selection even--more possible-- （possible）,so his mind was much----easier-(easy).
This mountain is--higher---(high)than all the other mountains in Europe.It is the --highest---(high)Cities are becoming---more crowded---(crowded)as the population is increasing.
Tianjin is not the -largest---(large)city in China though it is very--large--(large).
Which do you like -better-----(well),physics or chemistry.
This is the--best---(good)film I've ever seen.
We've got as--many---(many)books as we need.