This machine looks (a) / good but is very (b) / badly designed (c) / and doesn't work good (d) / no error (e)
good is an adjective. work is a verb; for a verb any adjective cannot be used. We need to use adverb.
"good" should be replaced by "well"
This machine looks good but is very badly designed and doesn't work good well.
Many of us (a) / do not know (b) / to swim (c) / at all (d) / no error
know verb should be followed by a wh word; in this sentence -how.
Many of us do not know how to swim at all.
He is well known (a) / for both his kindness (b) / as well as (c) / his understanding (d) / no error
as well as can never be used with "both"
Both always takes and with them
He is well known for both his kindness and his understanding.
Make haste (a) / lest (b) / you should not miss (c) / the train (d) / no error (e)
with "lest" we can never use any negative word.
Ramu closely (a) / resembles to his father (b) / not only in physical features (c) / but also in habits (d) / no error (e)
resembles is one of those verbs, after which to preposition can never be used.
Ramu closely resembles his father not only in physical features but also in habits.
After he had read the two first chapters (a) / of the novel (b) / he felt like reading (c) / the book at one sitting (d) / no error (e)
Always ordinal no comes before cardinal no.
After he had read the first two chapters of the novel, he felt like reading the book at one sitting.
The recent symposium on censorship (a) / indicated that to refrain with saying or writing (b) / something, others might object (c) / to, is a form of self censorship (d) / no error (e)
refrain verb always takes preposition from with it
The recent symposium on censorship indicated that to refrain from saying or writing something, others might object to, is a form of self censorship.
Had they have been in (a) / my condition, (b) / they would have left (c) / mserable and thought of commiting suicide (d) / no error (e)
The Indian way (a) / of thinking is superior (b) / to most of the countries of the world (c) / no error (d)
in preposition should be replaced with of
The Indian way of thinking is superior to most of the countries in the world.
The secretary of the worker's union (a) / remarked that the present government is so selfish (b) / that it cared very little (c) / about solving anyone else's problem (d) / no error
Entire sentence starts with past tense, hence " is " should be replaced with "was"
The secretary of the worker's union remarked that the present government was so selfish that it cared very little about solving anyone else's problem.