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( ) 3. Some children are playing the trees the river.
A. in;by B. on;by
C. by;over D. over;on
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( ) 2. Tom rode so fast that he from his bike yesterday.
A. fell over B. fell down
C. fell into D. fell behind
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( ) 1. When I arrived his office,he on the phone.
A. at;was speaking
B. in;spoke
C. in;is speaking
D. at;speaking
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