-- Mr. White, will you please teach me how to perform pair skating today?
-- . You have to practise single skating well first.
| A．Two heads are better than one. | B．Think twice before you do. |
| C．Learn to walk before you run. | D．One today is worth two tomorrows. |
.The United States signed up Friday for the 2010 Shanghai World Expo,_______it the last major country to join the event.
| A．making | B．made | C．to make | D．having made |
.In this experiment, they are wakened several times during the night and asked to report what they__________.
| A．had just been dreaming | B．had just dreaming |
| C．are just dreaming | D．have just been dreaming |
--I hear Michael is in hospital.
----Oh, really? I____know. I______go and visit him.
| A．didn’t; am going to | B．don’t;would | C．don’t;will | D．didn’t; will |
Children find_____difficult to sit for hours with little to do while flying.
| A．which | B．this | C．that | D．it |
---Must I see a doctor right now?
----No, you______see a doctor for the time being.
| A．can’t | B．shouldn’t | C．needn’t | D．mustn’t |