A. It's 10 o'clock on Friday morning and the volunteers are busy.

2. are being tied (Colorful ribbons: Những dải ruy băng đầy màu sắc)

3. is being chosen

4. are being checked (The costumes: Những bộ trang phục)

5. is being built (A stage: một sân khấu)

B. Later that day, Amy arrived to help with the preparations.

2. were being delivered

3. were being placed

4. was being made

`A.` 

`1.` are being put up ( đang được đưa lên )

`2.` are being tied ( đang bị ràng buộc )

`3.` is being chosen ( đang được chọn ) 

`4.` are being checked ( đang được kiểm tra )

`5.` is being built ( đang được xây dựng )

`B.` 

`1.` were being decorated ( đang được trang trí )

`2.` were being delivered ( đã được giao )

`3.` were being placed ( đã được đặt )

`4.` was being made ( đã được thực hiện )