Thecolloquialorspokenlanguageisthelanguagefortheuseofthe________.
IntheGrammar-TranslationMethod,grammaranalysisandtranslationprovedtobe_______instudyingforeignculturethroughliteraryworks.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
They________extensiveandpossiblydangerousactualflighttraining.