व्याकरणिक संरचना को बनाए रखने के लिए रिक्त स्थान में कौन सा संयोजक (conjunction) सबसे उपयुक्त बैठता है: 'The other of these two centre doors leads to the junior clerk's room, ____ the third door is that leading to the partners' room'?

Select the correct option to complete the given sentence: 'Students will not be allowed to enter the examination ________ they complete the registration and submit the required portfolio by the deadline.'

Complete the sentence with a suitable conjunction: '________ life had been difficult for Neelam recently, she believed she had to strive towards success regardless.'