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（1）A: What are you doing, Nancy?
B: I ( do）my homework.
（2）Look! Tom and Wang Bing (play）table tennis.
（3）Listen, the children (sing）in the music room.
（4）A: Where’s Mike?
B: He (sleep）in his bedroom now.
（5）A: Do you like (jump)?
B: Yes, I do.
（6）Let’s (wash）clothes now.
（7）Don’t (run）in the classroom.
（8）I (watch）TV now. My father (read）English.
My mother (clean）the kitchen. We are very busy now.
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
