Here are the completed sentences that maintain a similar meaning to the original ones:

1. She spends thirty minutes doing this test.
→ It takes **thirty minutes to do this test**.

2. Why don’t we go swimming this afternoon?
→ What about **going swimming this afternoon**?

3. The theater is near Bob's house.
→ Bob's house isn't **far from the theater**.

4. No one in my class is as intelligent as Lam.
→ Lam is **more intelligent than anyone in my class**.

5. Nhi began learning English five years ago.
→ Nhi has **been learning English for five years**.