They________extensiveandpossiblydangerousactualflighttraining.
NeitherEnglishnorChinese________difficulttolearn.
ThetheoryoflanguageunderlyingtheGrammar-TranslationMethodwasderivedfrom_____Linguistics.
Thefirsttaskofabrochureisto_______.
Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
