Complete each sentence with a linking verb :
1. Birds ........... the only animals vovered with feathers
2. There .......... about 9,000 types of birds on the planet.
3. The fastest bird ........ the write - throated spinetail swift .
4. Some scientists think birds and dinosaurs ......... members of the same family a long time ago .
5. One day the answer to this question...... clear
Loga
Sinh Học lớp 12
