Passengers are permitted only one piece of hand luggage onto the plane.
| A．to carry | B．carrying | C．to be carried | D．being carried |
Professor Smith, along with his assistants, _____on the Project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
He met his previous teacher ________ at abroad.
| A．by any chance | B．by the chance |
| C．by chance | D．by a chance |
Tom, ______ yourself .Did you forget the school rules?
| A．behave | B．believe | C．perform | D．conduct |
He is the only one of the students who ______a winner of a scholarship for three years.
| A．is | B．are | C．have been | D．has been |
Though having lived abroad for years, many Chinese still ______ the traditional customs.
| A．perform | B．possess | C．observe | D．support |