| knuckle down(verb, expression, study, give, direct) |
| make effort(verb, expression, study, give, direct) |
| peg away(verb, expression, study, give, direct) |
| persevere(verb, study, give, direct, use) |
| plug(verb, study, give, direct, use) |
| pour it on(verb, expression, idiom, study, give) |
| pull out all stops(expression, idiom, study, give, direct) |
| scratch(verb, study, give, direct, use) |
| study(verb, give, direct, use, operate) |
| support |
| sweat(verb, study, give, direct, use) |
| throw(verb, study, give, direct, use) |
| try(verb, study, give, direct, use) |
| turn(verb, study, give, direct, use) |
| work hard(verb, expression, study, give, direct) |
| administer(verb, direct, use, operate, employ) |
| assign(verb, direct, use, operate, employ) |
| be adamant |
| be assiduous |
| be indefatigable |