IV. Complete the following sentences with the correct forms of the verbs in brackets 1. Tom is a busy person. He (work) on a very important project recently. 2. I have holes in my socks. I must (buy) a few pairs. 3. My mother (go) shopping. She (be) back in an hour. 4. We never (ride) on a rollercoaster (tàu lượn siêu tốc). 5. How often they (have) dancing classes? 6. The babysitter (not go) until the parents (return) home.
