1) Burned midnight oil 2) Focused intently 3) Gazed earnestly 4) Having tiny openings 5) Like human skin 6) Like leaves and skin 7) Meditated 8) Read carefully 9) Read earnestly 10) Read studiously 11) Studied attentively 12) Studied hard 13) Studied in depth 14) Studied over 15) Studied with care 16) Waded through 
• (imp. & p. p.) of Pore