1 . Passengers are permitted         only one piece of luggage on to the plane.

A．carrying

B．to carry

C．carried

D．carry

2 . The professor could hardly find sufficient grounds on which ________his arguments in favour of the new theory.

A．are based	B．are basing
C．based	D．to base

3 . We are desperate________ whether the method is working.

A．seeing

B．seen

C．saw

D．to see

4 . He isn’t easy _______.

A．to get along

B．to get along with

C．getting along

D．getting along with

5 . Our guests are scheduled _______at 7:30 in the evening.

A．to arrive

B．arriving

C．arrived

D．to have arrived