用am is are 填空出题
- The dog ____ barking at the mailman.
- We ____ going to the park tomorrow.
- I ____ excited to see my family for the holidays.
- They ____ playing soccer in the backyard.
- She ____ eating an apple for a snack.
- He ____ writing a letter to his pen pal.
- The students ____ studying for their exams.
- My parents ____ going on vacation next week.
- The birds ____ chirping in the trees.
- The flowers ____ blooming in the garden.
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