Fill in the blanks with the correct prepositions, articles, conjunctions, and modal verbs.

21) He always stops his car at this stop ____ 5:30 P.M.
The preposition "at" is used for specific times.
The correct option is D.
D) at

22) You are prepared ____ the test.
The phrase is "prepared for".
The correct option is C.
C) for

23) He jumped ____ the river to save.
"Into" indicates movement from outside to inside.
The correct option is B.
B) into

24) Neither of the paintings ____ sold.
"Neither of" takes a singular verb.
The correct option is D.
D) is

25) ____ he is very rich, he lives a very simple life.
"Although" is used to show a contrast.
The correct option is B.
B) Although

26) It was so noisy that we ____ hear ourselves speak.
The main clause is in the past tense ("was"), so "couldn't" (past negative ability) is appropriate.
The correct option is D.
D) couldn't

27) India works for ____ in the world.
"Peace" is the correct noun to complete the phrase "works for peace".
The correct option is A.
A) peace

28) You are ____ hour late.
"Hour" starts with a vowel sound, so the indefinite article "an" is used.
The correct option is B.
B) an

29) ____ it help you in your studies?
"Will" is used to form a question about a future possibility or willingness.
The correct option is A.
A) Will

30) I think you should apologize when you ____ her.
In a subordinate clause introduced by "when" referring to a future event, the present simple tense is used.
The correct option is A.
A) see

31) We waited ____ the plane took off.
"Until" indicates the duration up to the point when the plane took off.
The correct option is D.
D) until