Complete the following sentences with the correct forms of the verbs in brackets

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.