• approximately
• approaching
• close to
• in respect to
2-bad
• defective
• inadequate
• unsatisfactory
3-basic
• essential
• indispensable
• elementary
• rudimentary
• have a rudimentary grasp of sth.
4-begin
• commence
• commence building work
• initiate
• initiate a program of economic reform
• originate
5-better
• preferable
• superior
• worthier
6-big
• massive
• extensive
• immense
7-certain
• unquestionable
• incontrovertible
• indubitable
8-change
• alter
• transform
• diversify
9-choose
• select
• prefer
• identify
10-indefinitely
• unquestionably
• precisely
• inescapably
• undoubtedly
• indubitably