wade through (?.)

• bone
• con
• contemplate
• dig
• drill
• drudge
• elucubrate
• examine
• fag
• go over
• grind
• grub
• hammer
• hammer away
• lucubrate
• moil
• peg
• peg away
• peruse
• plod
• plug
• plug along
• plug away
• plunge into
• pore over
• pound away
• practice
• read
• regard studiously
• restudy
• review
• slog
• study
• swot
• toil
• travail
• vet
• work away