1. ________ your brother ________ (watch) TV now?

2. We ________________ (play) basketball now.

3. — What ________ she ________ (do)?

— She _________________ (ride) a bike.
4. Those boys ________ (play) football on the playground.

5. They ________ (talk) in English.

6. Those children ________________ (sing) in the classroom.

7. The naughty boy ________________ (swim) in the river.

8. ________ Mary ________ (play) the piano?


同类型试题

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2


y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

