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Question 17: It's not necessary for students to bring their own tablets to school every day.

The original sentence means students are not required to bring their tablets. The options express different levels of necessity or obligation. The correct option should reflect the absence of necessity.

• A. Students should bring their own tablets to school every day. (Incorrect - expresses a recommendation or obligation)
• B. Students have to bring their own tablets to school every day. (Incorrect - expresses a necessity)
• C. Students must bring their own tablets to school every day. (Incorrect - expresses a strong obligation)
• D. Students don't have to bring their own tablets to school every day. (Correct - expresses the absence of necessity)

Answer 17: D

Question 18: It is necessary for us to make every effort to finish our essay before the deadline.

The original sentence means we are required to make every effort. The options express different levels of necessity or obligation.

• A. We should finish our essay before deadline. (Incorrect - expresses a recommendation)
• B. We have to finish our essay before deadline. (Correct - expresses a necessity)
• C. We must finish our essay before deadline. (Correct - expresses a strong obligation)
• D. All are correct. (Incorrect - 'should' has a different meaning)

Both B and C correctly convey the necessity expressed in the original sentence. Depending on the nuance intended (general necessity vs. strong obligation), either could be considered correct. However, since the original uses "necessary," both "have to" and "must" are valid.

Answer 18: B or C (both are acceptable)

Now let's unscramble the sentences:

Question 19: can / photos / Visitors / temple. /in / this / take

Unscrambled: Visitors can take photos in this temple.

Question 20: courses / Both / you / abroad. / allow / to study

Unscrambled: Both courses allow you to study abroad.