For question 4, it suggests 'lets down his friends', but I think the option should be 'lets his friends down'?
It's also a bit biased for me filling out this test, because once I started ticking off a few of the phrasal verbs, I started always going towards them to complete the sentence. You might want to make the test with a few control questions where there are some questions that don't include phrasal verbs as answers, so that the test takers don't catch on that you're asking them how many situations they'd use them in.