Answer: challenging problems
Explanation:
Whatever completes the text would have be something that relates to the problems that are to be solved as this is the subject of the sentence and it would have to be in the negatives due to the use of the word "unfortunately".
The best option is therefore the above because too many challenging problems relates to the subject of problems and is not a good thing.
Answer:
Persuasive language is used for many reasons, for example, to help to sell products or services, or to convince people to accept a view or idea. Politicians often use persuasive techniques to get their audience to agree with their views on a particular topic.
Answer:
For the first one: You jumped high. Underline You once, underline jumped twice
Explanation: