Learners can feel very ...... if an exercise is too difficult.
A. courageous
B. encouraging
C. discouraged
D. discouragingly
Giải bởi Vietjack
Đáp án: C
Giải thích: Vị trí trống cần tính từ, dựa vào nghĩa chọn C
Dịch: Người học có thể cảm thấy rất nản lòng nếu một bài tập quá khó.
If people stop destroying animal's natural habitat, more species will survive and produce .......
Oil spills are having a devastating effect on coral reefs in the ocean.
What exactly is the influence of air pollution ...... human beings?
The society was set up to ...... endangered species from extinction.
The campaign will hopefully ensure the survival ...... the tiger.
Among the problems facing the national park's manager, the most serious ones are those of ...... and expansion.
The ...... friendly products are designed not to harm the natural environment.
