Prepositions

Step 1: Understanding the Concept:
This question tests the correct usage of prepositions of time, specifically with the present perfect tense ("has been"). The choice between "for" and "since" is a common point of confusion.
Step 2: Key Formula or Approach:
- Use for with a period or duration of time (e.g., for two hours, for five days, for a long time).
- Use since with a specific point in time in the past (e.g., since 9 AM, since Monday, since 2020).
Step 3: Detailed Explanation:
1. Identify the Tense: The sentence "Ramesh has been absent" is in the present perfect tense. This tense is often used to describe an action that started in the past and continues to the present.
2. Identify the Time Reference: The time reference given is "Friday." "Friday" is a specific point in time, marking the beginning of Ramesh's absence.
3. Apply the Rule: Because "Friday" is a point in time, the correct preposition to use is "since." The sentence means that the absence started on Friday and has continued up to now.
4. Analyze the Options:
- (A) since: Correct, used for a point in time.
- (B) from: "From" is usually used with "to" or "until" to mark a start and end point (e.g., "from Friday to Monday"). It doesn't fit here.
- (C) for: Incorrect, used for a duration of time (e.g., "for three days").
- (D) by: Incorrect, "by" means "not later than" (e.g., "be back by Friday").
Step 4: Final Answer:
The correct preposition is (A) "since".

Step 1: Understanding the Concept:
This question tests the correct preposition to form a phrasal verb with "think". The adverb "deeply" gives a clue about the meaning required.
Step 2: Detailed Explanation:
Let's analyze the phrasal verbs with "think":
- Think by/in: These are not standard phrasal verbs.
- Think over: This means to consider something carefully and thoroughly before making a decision. This meaning fits perfectly with the adverb "deeply".
- Think off: This is not a standard phrasal verb. The phrase is "think of" which means to have an idea or remember something.
The sentence "We should think over this matter deeply" means we should consider this matter carefully. This is a logical and grammatically correct sentence.
Step 3: Final Answer:
The correct option is (C) because the phrasal verb "think over" means to consider something deeply or carefully.

Step 1: Understanding the Concept:
This question tests the knowledge of phrasal verbs. The correct phrasal verb must fit grammatically and contextually with the preposition "upon".
Step 2: Detailed Explanation:
The sentence expresses advice about how one should treat the poor. The structure is `look ... upon`.
- (A) look up: This phrasal verb means to search for information or to admire someone. It is not used with 'upon' in this context.
- (B) look down upon: This is a three-word phrasal verb meaning to regard someone with a feeling of superiority or contempt. The sentence "They should not look down upon the poor" makes perfect sense.
- (C) look after: This means to take care of someone. It is not used with 'upon'.
- (D) look on: This means to watch something without getting involved. It is not typically followed by 'upon' in this sense.
Step 3: Final Answer:
The correct phrasal verb that fits the sentence is 'look down upon'. Thus, 'look down' is the correct phrase to complete the expression. Therefore, option (B) is correct.