To determine the grammatically correct sentence, it is important to understand the structure and use of modal verbs and phrases like "had better," which is used to indicate advice or a recommendation to avoid a consequence. The phrase "had better" should be followed by the base form of the verb without "to." In this context, the sentence that correctly uses this structure is:
"You had better tell her everything, or else you will lose a friend."
Let's analyze why this option is correct:
The other options are incorrect due to improper use of verb tenses or structure:
Among scientists, the discovery of the double helix structure of DNA and the genetic code it incorporates is widely regarded to be one of the most significant scientific discovery of the twentieth century.
If the President knew that his allies would let him down so suddenly, he would have handled them with the greatest care.
Although the new policy aims to increase efficiency, reducing costs, and enhancing employee satisfaction, some employees feel that the changes are too abrupt and poorly communicated.
Match the following airlines with the countries where they are headquartered.
| Airlines | Countries |
|---|---|
| 1. AirAsia | A. Singapore |
| 2. AZAL | B. South Korea |
| 3. Jeju Air | C. Azerbaijan |
| 4. Indigo | D. India |
| 5. Tigerair | E. Malaysia |
Match the following authors with their respective works.
| Authors | Books |
|---|---|
| 1. Andy Weir | A. Dune |
| 2. Cixin Liu | B. The Time Machine |
| 3. Stephen Hawking | C. The Brief History of Time |
| 4. HG Wells | D. The Martian |
| 5. Frank Herbert | E. The Three Body Problem |