Read the text and put the words into the most appropriate grammar form.

Robert was an outstanding student in our class because of (he) mathematical skills.
He could do any kind of (task).
Many of us tried to make friends with him, but he spent (many) of his time practising maths.
Once I asked Robert to help me prepare for a test. To my surprise, he (agree) immediately.
"I (help) you," he said, "but first, i need to check your knowledge of maths."
He asked me a few questions, but I (not can) answer a great number of them. I was upset, but Robert said: "Don't worry. If we (know) everything, we wouldn't need to learn. I'm sure you are much (smart) than me in something else."