Cho dạng đúng của động từ trong ngoặc:
1. He is engrossed in doing(science)................ research.
2. Oil spills are a great(threaten)............. to the undersea world.
3. He wants(width)................ his knowledge of the subject.
4. You may be surprised at the large(varied).................. of animals in national parks.
Cho dạng đúng của động từ trong ngoặc:
1. He is engrossed in doing(science)..scientific.............. research.
2. Oil spills are a great(threaten)......threat............ to the undersea world.
3. He wants(width)...widen............. his knowledge of the subject.
4. You may be surprised at the large(varied).....variety............. of animals in national parks.