1. He won first place in the math contest.

2. He got first place in the speech contest.

3. He received first place in the science contest.

(Are they all grammatical? Can we use all the verbs?)

All are grammatically correct, and yes, you can use all those verbs. The first sentence is best, though.

Yes, all three sentences are grammatically correct. You can use each of the verbs "won," "got," and "received" to describe achieving first place in different contests. These verbs represent different ways of expressing the same idea. Here's how you can use each verb in a sentence:

1. "He won first place in the math contest." - This implies that he achieved first place through competition or by being the best in the math contest.

2. "He got first place in the speech contest." - This suggests that he obtained or achieved first place in the speech contest. It does not specify the method or manner in which he did so.

3. "He received first place in the science contest." - This indicates that he was given or awarded first place in the science contest.

All three verbs are acceptable and convey the same meaning, but they offer slightly different nuances in terms of how the achievement is described.