Wewon’tallowanyforeigncountryto_______inourinternalaffairs.

Heworksinouruniversityasavisiting_______,notasaformalfacultymember.

With the help of the government , a large number of people ---_______ after the flood in 1991.

Both sugar and salt can ______in water.

Sometimes it is very difficult to _______ some of the English words. Even the native speaker can not help.