. Complete the sentences with the correct form of the verbs (present simple, present continuous, or present perfect).

1. _________ (you/ talk) about the upcoming journey? Can I join?

2. Recently, the United States___has altered_____ (alter) the whole of their immigration laws.

3. Either kangaroo or Sydney Opera House__________ (symbolize) Australia.

4. Look at the London Eye! The wheel_____is appearing_____ (appear) motionless, but it__________  (rotate) slowly.