Frank will fall behind in studies he works hard from now on．（ ）
A．unlessB．becauseC．if
There are 24 solar terms in a year． Grain Rain often starts in April， the ____ month of the year．（ ）
| A． |
third |
B． |
fourth |
C． |
fifth |
Today， all the erhu masters play and praise Erquan Yingyue． It ____ one of China's national treasures．（ ）
| A． |
becomes |
B． |
became |
C． |
has become |
Everyone wants to win in the contest． But I think ____ is to learn something and have fun．（ ）
| A． |
the most important |
| B． |
important |
| C． |
more important |
The Meitan Tea Museum， a famous building in Guizhou，_____ in the shape of a giant teapot．（ ）
| A． |
will be built |
| B． |
should be built |
| C． |
was built |
The UN set October 16th as World Food Day to tell people to value food ____ care more about the hunger problem．（ ）
| A． |
but |
B． |
so |
C． |
and |