I t’s quite common in Britain to say “Thank you” to the drivers       people get off the bus.

A．after

B．since

C．until

D．when

I t is one of the _______ international airlines.

A．busy

B．busier

C．busiest

D．most busy

 

I t doesn’t matter if _______ boys play basketball too much instead of watching TV.

A. sixteen-years-old                        B. sixteen-year-olds

C. sixteen year old                     D. sixteen-year-old