According to a new study by a British university, learning ____ second language can lead to ____ increase in your brain power.
| A．a; the | B．/ ; the | C．a; an | D．the; an |
He ＿＿articles for our wall-newspaper these three years, and he ＿＿about forty articles.
| A．has been writing； has written | B．has been writing； wrote |
| C．is writing； has been writing | D．has written； has written |
The children ＿＿very quiet；I wonder what they ＿＿up to.
| A．were； are being | B．are being；are | C．are；do | D．are being；do |
Jim talked for about half an hour yesterday. Never＿＿ him talk so much.
| A．I heard | B．did I hear | C．I had heard | D．had I heard |
— ＿＿ Betty this morning?
— Not yet, but she is sure to be here before noon.
| A．Have you seen | B．Will you see | C．Do you see | D．Did you see |
— Are you a visitor here?
— That’s right. I＿＿round the world and now my dream of coming to China＿＿true.
| A．have traveled； has come | B．was traveling； had been come |
| C．am traveling； has come | D．have traveled； has been come |