Instruction
Select the best answer to complete the sentence.
1. Babies under 1 year old have to get some vaccine to protect -------- infecting serious diseases.
2. This contract is -------- to approval by all the board members.
3. The flight was delayed -------- bad weather.
4. I never said that taming a tiger would be a -------.
5. The password should -------- of at least six characters and numbers.
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