-- I’d like to invite you to a concert this evening.
-- Thank you, but _______ I’ll be free I’m not sure at the moment.
| A．while | B．if | C．whether | D．when |
.
Bay, Amazon and Wall Mart are popular websites ______ people can sell goods to each other.
| A．where | B．which | C．when | D．whose |
.
—_____ he have been chosen as captain of the football team?
—Yes, he______.
| A．Can; must have | B．Must; must have | C．Can; must | D．Must; must |
.
The Bank of China, having so far woven its network in 27 countries, ______ its business in Brazil in June 2009.
| A．has started | B．was starting | C．will start | D．started |
.
What impresses me most is ______ he appears in front of others, he wears a sincere and charming smile.
| A．what | B．which | C．that where | D．that whenever |
.
All the tickets have been sold out. ______ is left.
| A．No one | B．Nothing | C．None | D．Not anyone |