For the following questions answer them individually
Select the most appropriate option to fill in the blank.
Scientists all over the world are engaged in ______ how to find a vaccine for COVID-19.
Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution required'.
He won’t come to the party unless you will invite him personally.
Select the most appropriate meaning of the idiomatic expression given.
To cross one’s mind
Select the most appropriate word to fill in the blank.
The marking of answer papers is ______ out by the course teacher.
In the given sentence, identify the segment which contains the grammatical error.
Cyclone Amphan roared into West Bengal on Wednesday leave behind a trail of devastation across a large area of the State.