Choose the letter A, B, C or D to complete the passage below

Water pollution happens __________ (6) toxic substances enter water bodies such as lakes, rivers, oceans and so on, getting dissolved in them, lying suspended in the water or depositing on the bed. This degrades the quality of water. Not __________ (7) does this spell disaster for aquatic ecosystems, the pollutants also seep through and reach the groundwater, which might end up in our households as contaminated water we use in our daily activities, including drinking.

Water pollution can be __________ (8) in a number of ways, one of the most polluting being city sewage and industrial waste discharge. Indirect sources __________ (9) water pollution include contaminants that enter the water supply from soils or groundwater systems and from the atmosphere via rain. Soils and groundwater contain __________ (10) residue of human agricultural practices and also improperly disposed of industrial wastes.

Pollutants can be of varying kinds: organic, inorganic, radioactive and so on. In fact, the list of possible water contaminants is just too vast to be listed here.

Question 10: 

A. a

B. an

C. the

D. x

Thanh Giong Festival/ commemorate/ Saint Giong/, an imaginary/ hero/ the/ Vietnamese.

A. Thanh Giong Festival commemorates Saint Giong, a imaginary hero of the Vietnamese.

B. Thanh Giong Festival commemorates Saint Giong, an imaginary hero of the Vietnamese.

C. Thanh Giong Festival commemorate Saint Giong, an imaginary hero of the Vietnamese.

D. Thanh Giong Festival commemorate Saint Giong, a imaginary hero of the Vietnamese.

Many/ children/ Vietnam/ look forward/ Mid-Autumn Festival/ because/ they/ can/ go parade.

A. Many children in Vietnam look forward on Mid-Autumn Festival because they can go parade.

B. Many children in Vietnam look forward for Mid-Autumn Festival because they can go parade.

C. Many children in Vietnam look forward to Mid-Autumn Festival because they can go parade.

D. Many children in Vietnam look forward of Mid-Autumn Festival because they can go parade.

Hiện tượng xuất hiện ở thế hệ sau nếu thực hiện tự thụ phấn bắt buộc ở cây giao phấn là:

A. Có khả năng chống chịu tốt với các điều kiện của môi trường 

B. Con cháu xuất hiện ngày càng đông, có nhiều kiểu gen, kiểu hình 

C. Cho năng suất cao hơn thế hệ trước 

D. Sinh trưởng và phát triển chậm, bộc lộ tính trạng xấu

Khi làm nóng một lượng chất lỏng đựng trong bình thủy tinh thì khói lượng riêng của chắt lỏng thay đổi như thế nào

A.Giảm

B.Tăng

C.Không thay đổi

D.Thoạt đầu giảm rồi sau mới tăng