... Fifteen-minute test Grade: 12 basicFull name: Class: 12 Underline the correct alternative in the following sentences.1. Hung studied very hard, but/so he still failed the exam. 2. Lan studied ... the exam. 2. Lan studied very hard, so/but she passed the exam very easily.3. It was very cold last weekend, but/so, we still went for our picnic.4. It was very cold last week, so/but we had ... need to give it a second thought.Fifteen-minute test Grade: 12 basicFull name: Class: 12 Fill each blank with but, so, however or therefore where appropriate. 1. This is the shortest way to...