Direction: Each of the following sentences is given with blank space(s) to be filled in with appropriate word(s). Four alternatives are suggested for each sentence. Choose the correct alternative.I intend to work ______ late afternoon.

The correct answer is option 1, i.e., Till.The sentence uses the blank after the verb, indicating that the blank must CONTAIN a preposition.Let's LOOK at how the given prepositions are used:Till- up to (the point in time or the event mentioned). e.g. I will not eat till evening.Since- in the intervening period between (the time mentioned) and the PRESENT. e.g. I have not eaten since morning.For- an amount of time or distance. e.g. I have not eaten anything for TWO days.About- on the subject of; concerning. e.g. I have not thought about food.Here, the time mentioned is in the future, i.e., 'LATE afternoon', up to which point the action of working is happening.So, the correct preposition here would be 'till', which shows the action projected in future time.Thus, the complete sentence is: I intend to work till late afternoon.