(3-3, 4)
Choose the better option.
1) Don't be late. The concert (starts/start) at six.
2) Please wait here. Professor Johnson (comes/is coming) soon.
3) We (flew / were flying) to Sapporo at ten, but our flight was canceled.
4) I'll call you when I (arrive / will arrive) at the station.
5) Usually my sister (stays/will stay) home on Sundays, but tomorrow (she goes/she's
going) out.