1. He pulled back, having to ......... considerable force against her surprising strength.

do

make

exert

do

2. All soldiers must .......their duty

do

make

exert

go

3. When I grow up, I want to have a job that allows me to ............ a lot of money

do

make

exert

go

4. he continued to ........ all his powers to restrain his troops from attacking.

do

make

exert

go

5. I always ........ my best

do

make

exert

go

6. I think the airplane leaves at 8 a.m., but you had better ......... sure

do

make

exert

go