Puzzle of the Week #260 - Semi-grams

Rearrange the letters in each of these ten five-letter words and then pair them up to form five ten-letter words. I’ve completed one of the ten letter words to start you off:

First halves:

(ALERT)    METRO    NOTED TIMES    UPSET

Second halves:

GIANT    (RATIO)    ROAST SENSE    SOUND

Example solution:

ALERT + RATIO = RETAL + IATOR = RETALIATOR