The local government has been accused of not responding _________ to the needs of the homeless in the flood-stricken area．

Circus tigers, although they have been tamed, can _____ attack their trainer.

Italians often approach others closely and are more     to touch them. 

Since I knew how hard the life they lead is, I have understood ____ they need so much money.

_____ lie in the sun for too long, _______ you will get sunburnt.