A. climb B. doubtful C. February D. thumb

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eating; climbing eating; climb eat; climbing eat; climb

to listen; to climb listening; to climb listening; climbing listening; to climbing

will climb would climb are climbing climb

climbing climbed to climb climb

hardly to climb the mountain hard to climb the mountain to climb the mountain hard to climb the mountain hardly

climb climbed are climbing will climb

climb climbs to climb climbing

climbing climb climbs to climb

climbing; will allow climbing; allows to climb; allows to climb; will allow

sure hesitant doubtful secure

climb climbing to climb climbed

walk; climb walking; climbing walking; to climb walk; to climb

climb to climb climbing climbed

Climb Climbing If you climb When climbing

hardly to climb the mountain hard to climb the mountain to climb the mountain hard to climb the mountain hardly

hardly to climb the mountain hard to climb the mountain to climb the mountain hard to climb the mountain hardly

climb climbing to climb climbs

This,climbing This,to climb It,to climb It,climbing

Climb To climb For climbing They climbed

walk; climb walking; climbing walking; to climb walk; to climb