-----I called you yesterday evening, but you were not in.-----Sorry, I _____ in the shop with my mother.
—When is your birthday? —It’s ________ December 25th.
—Anna doesn’t _______ a black skirt. —But she ________ a red one.
—Let’s watch the tennis game on TV. —That ________ good.
—Let’s _________ soccer. —Great! But I don’t have a soccer ball.
—Do you like math? —Yes, it’s difficult ________ really interesting.