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（1）A：What are you doing, Sam？
B：I am _________.
（2）A：_____ is she？
B：She is Mary.
A：_____ is she doing？
B：She’s writing.
（3）A：_____ _____ your sister？
B：Yes, she is.
A：What ______ _____ _____？
B：She is working.
（4）A：Do you like English？
B：No, I ______.
A：What do you like best？
B：I like ______ best.
（5）A：_____ ______ _______ _______？
B：I’m from England.
A：_____ ______ like singing？
B：Yes, I do.
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
