1. "Vamos a el cine" should be "Vamos <em><u>al</u></em> cine"
3. "Voy a el restaurante" should be "Voy <em><u>al</u></em> restaurante"
4. "Va a el campo" should be "Va <em><u>al</u></em> campo"
Explanation:
In Spanish, when the preposition a is used followed by the article el, a contraction occurs and the result is the article al. It is not correct to pronounce or write those two separate words: a + el = al.