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The ​ (a)   discovered dinosaur​ (b)  

• ravine
• skull

The paleontologists​ (a)   through the ​ (b)   of sedimentary (c)  

• dug
• layers
• rock

Amy's​ (a)   pastime is ​ (b)   about​ (c)  

• favorite
• to read
• nature

The students ​ (a)   the ravine​ (b)   the layer of​ (c)  

• walked down
• to see
• ash

Frank went​ (a)   to examine ​ (b)   findings from the dinosaur​ (c)  

• to the lab
• his
• dig

They​ (a)   a bone​ (b)   had to be​ (c)  

• discovered
• that
• excavated

Karen's​ (a)   will try​ (b)   the age of the skull

• father
• to determine

Jerome​ (a)   on the rock, ​ (b)   fortunately​ (c)   didn't get​ (d)  

• tripped
• but
• he
• injured

Abe's​ (a)   is looking​ (b)   dinosaur bones

• favorite
• at

Karen​ (a)   of finding​ (b)   dinosaur skull

• dreams
• a