people develop ________ preference for a particular style of learning at ______ early age and these preferences affect learning..
| A．a; an | B．a; 不填 | C．不填； the | D．the; an |
—I'm going to travel along the Mekong River next week.
—______________.
| A．Have fun | B．Take care | C．Best wishes | D．Write to me. |
After working for two hours, I foundimpossible to complete the paper in time.
| A．me | B．this | C．that | D．it |
Although ________ to stop, he kept on working
| A．tell | B．telling | C．having told | D．told |
Was_______ John’s quick action and knowledge of first aid ________ saved her life?
| A．it, which | B．that, what | C．it, that | D．it,/ |
Only after you have reached eighteen _______ the army.
| A．you can join | B．can you join |
| C．you can join in | D．can you join in |