I will be leaving for Delhi tonight and . . . . . . . . to return by this week end.

The correct answer is: plan.

The other options are not correct because:

• waiting: This does not make sense in the context of the sentence. The speaker is not waiting to return to Delhi.
• likely: This does not make sense in the context of the sentence. The speaker is not saying that it is likely that they will return to Delhi.
• going: This is a possible answer, but it is not the most likely answer. The speaker is not simply going to Delhi. They are planning to return by the weekend.
• making: This does not
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