I tried to ______ in my speech how grateful we all were for his help

The government has promised to             the matter and give the workers a satisfactory answer.

 It’s reported that the fire that ______ at two o’clock last night caused a lot of damage.

—How are your children in their new home?—Fine. The good thing is that they've _______very easily to new environments.

Scientific researches show that to _________ a language one had better often get exposed to it.