Question 1
Take your umbrella with you. It________ rain in the afternoon.
- A.must
- B.might
- C.has no
- D.should
Show the answer and explanation
Answer: B might
Why
The speaker is guessing about the weather, so the blank needs a modal of possibility. Might means that rain is possible but not certain, which is exactly why you should carry an umbrella.
Must is the tempting one, but it claims certainty, and nobody is certain about the afternoon. Should gives advice, and has no is not a modal at all.
Rule: use may or might for something that is possible in the future, and must only when you are sure.