......................... has the shape of clover-leaf.

Explanation

**Step-by-Step Solution:**

1. **Identify the Type of RNA**: The question asks about a structure that has the shape of a cloverleaf. The type of RNA that exhibits this shape is Transfer RNA (tRNA).

2. **Describe the Cloverleaf Structure**: tRNA is known for its distinctive cloverleaf shape, which is formed by the folding of the RNA strand into three loops and a stem. This structure is crucial for its function in protein synthesis.

3. **Function of tRNA**: tRNA plays a vital role in the process of translation, where it helps in the synthesis of proteins by bringing amino acids to the ribosome. Each tRNA molecule carries a specific amino acid and has an anticodon that is complementary to the codon on the messenger RNA (mRNA).

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