Regular verbs in simple past (D)

Transform these regular verbs in base form into simple past. Remember that you have to add -d, -ed, -ied, or double the consonant in "cvc verbs" before you add -ed. Examples:
Base form: dance
Simple past: danced

Base form: cook
Simple past: cooked

Base form: study
Simple past: studied

Base form: stop
Simple past: stopped