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1. Mary spent (the/a/-) year and (the/-/a) half working with (the/-/a) disabled
2.Don't disappoint me! I (count) (at/with/on/by) you right now

1. Mary spent (a) year and (a) half working with (the) disabled. 2. Don't disappoint me! I (am counting) (on) you right now.

1) a , a, the2) on you right now