While he was investigating ways to improve the telescope, Newton made _______ discovery which completely changed _______ man’s understanding of colour.
| A．a；/ | B．a；the |
| C．/；the | D．the；a |
_______ not to miss the flight at 15:20, the manager set out for the airport in a hurry.
| A．Having reminded | B．Reminded | C．To remind | D．Reminding |
It’s said that an American often starts a speech with a joke, _______ a Japanese seldom does.
| A．as | B．when | C．while | D．though |
It is still under discussion __________the old bus station should be replaced with a modern hotel or not.
| A．Whether | B．when | C．which | D．where |
As a punishment she was not permitted______part in any school activity in a week.
| A．taking | B．to take | C．take | D．to be taking |
A lot of small towns in Nanchong are definitely worth_____.
| A．visiting | B．visited | C．to be visited | D．being visited |