[ Vocabulary ]
What does “rigid” mean?
A. About life
B. Sensitive, easy to break
C. Having wonder, interest
D. Very stiff

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Grammar › ViewYou should always wear sunscreen in the sun, ___________ between 10:00 and 2:00 when the sun is hottest.
A. first
B. especially
C. however
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I don’t know where Mrs Black is. She isn’t in the kitchen, so she _____ in the garden.
A. should have worked
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Where is the source of this river? Source means:
A. Water
B. Where something goes to
C. Weathering and erosion
D. Where something comes from