পেট্রোবাংলা প্রিলি ও লিখিত সমন্বিত প্রস্তুতি [Archived]১টি পরীক্ষায় এসেছেপ্রশ্ন ১২Oxygen is one of the most vital elements. (positive)কNo other elements is as vital as Oxygen.খVery few elements are as vital as Oxygen.গNo other elements are as vital as Oxygen. ঘVery few elements are vital as Oxygen.ঙVery few elements as is vital as Oxygen.উত্তর দেখুন