—___John come here tonight?
—I’m not sure, but he ______ stay at home.
| A．May, might | B．Can, must | C．Must, might | D．Can, might |
All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.
| A．to be cancelled | B．were cancelled |
| C．have been cancelled | D．having been cancelled |
The poem A Red, Red Rose written by Robert Burns is popular with the Chinese young people, because the poem is easy ________.
| A．to be understood | B．to understand |
| C．understand | D．understanding |
Passengers are permitted______ only one piece of hand luggage onto the plane.
| A．to carry | B．carrying |
| C．to be carried | D．being carried |
Bats are surprisingly longlived creatures, some______ a life span of around 20 years.
| A．having | B．had |
| C．have | D．to have |
It's important for the figures______regularly.
| A．to be updated | B．to have been updated |
| C．to update | D．to have updated |