What should we do ____________ biodiversity?
A. to maintain
B. maintain
C. will maintain
D. maintaining
Giải bởi qa.haylamdo.com
Đáp án: A
Giải thích: to V chỉ mục đích
Dịch: Chúng ta nên làm gì để giữ vững cân bằng sinh thái?
Organisms play ________ important role in keeping the nature balanced.
A big ocean in the world is divided ___________ five different parts: the Pacific, Atlantic, Indian, Antarctic and Arctic Oceans.
A large number of jellyfish are _________ stake due to overhunting.
They will never forget _______ the man-eating shark at the beach.
The director _______ for the meeting by the time I got to his office.
My mother told me she _______ very tired since she came back from a visit to our grandparents.
They can send submarines to take photographs of animal life and bring back to the __________ for further study.
Today’s scientists have overcome many of the challenges of the depth by ________ more sophisticated tools.
This season's _______ include five new plays and several concerts of Chinese and Indian music.
