Question

Look, dark clouds are gathering. It is ______ to rain soon.

1. A.
   perhaps
2. B.
   maybe
3. C.
   likely
4. D.
   probably

Answer 1

C
句意：看，乌云在聚集，一会很可能要下雨。此空应填形容词，因为前有is，perhaps，maybe，probably都为副词可排除。故选C。