past few months, the country _____ a furthertightening of supply restrictions, making fuel and food supplies more difficultto obtain

from the top of the tower ,the south foot of the mountain is a sea of trees

It is these poisonous products ______can cause the symptom of the flu, such as the headache and aching muscles.

下列各句中，没有语病的一句是（ ）

Our duty is to ______ their country against bothdomestic and foreign enemies’ attack