Условие задания:

3 Б.
Complete the statements using the correct form of 'to be' and the verb. Use the long (full) forms.
Example: He _______________ in the river. (to swim)
Correct: He is swimming in the river.
Incorrect: He's swimming in the river.
1. She  her cats. (to feed)
2. She  a song. (to sing)
3. Students  the song by heart. (to learn)