Neither English nor Chinese ________ difficult to learn.
C
neither…nor…是固定搭配，意思是：既不……也不……。它需要遵循就近原则，谓语动词应与Chinese一致，所以答案是C。
PoorspeakerofEnglishthoughhewasatthetime,hestillmanagedtomakehimself________.
Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
Thegovernmentcalledoutpolicementosuppresstheriot.