Which sentence has a dependent clause?

I know you're busy tonight and you can't join us.
The Moon is supposed to be exceptionally bright in the sky tonight.
We should practice the song again.
I watched so many movies that take place in London

http://www.chompchomp.com/terms/clause.htm

Read about clauses here; then let us know what you decide.

independent clause = main clause
dependent clause = subordinate clause

The sentence that has a dependent clause is: "I watched so many movies that take place in London."

Explanation: A dependent clause is a group of words that includes a subject and verb but cannot stand alone as a complete sentence because it does not express a complete thought. In this sentence, the dependent clause is "that take place in London." It cannot stand alone as a complete sentence and is dependent on the rest of the sentence for its meaning.