21. Why don't we take a tour around this city?

-> I suggest taking a tour around this city

22. How about getting a taxi to town.

-> I think we should get a taxi to town

23. Let's invite Tom to join our trip.

-> I suggest inviting Tom to join our trip

24. Shannon hasn't seen the water buffalo and rice paddies before.

-> This is the first time Shannon has seen the water buffalo and rice paddies 

25. Tim has never traveled to Vietnam before.

-> This is the first time Tim has traveled to VN