—Have you found the missing?couple in the mountain ?
—No, but we______hard to get in touch with them．
| A．have tried | B．have been trying | C．had tried | D．had been trying ． |
All we are required to do ______ record a "weike" where we explain what we think students are puzzled about．
| A．are | B．is | C．was | D．were |
It's not the score you've got, but the attitude you choose ______ determines our evaluation of your work．
| A．which | B．that | C．what | D．who |
So sudden_____ that the enemy had no time to escape．
| A．did the attack | B．the attack did |
| C．was the attack | D．the attack was |
—Why．Jack, you look so tired!
—Well．Ithe house and I must finish the work tomorrow．
| A．was painting | B．will be painting |
| C．have painted | D．have been painting |
To learn English well, we should find opportunities to hear Englishas much as we can．
| A．speak | B．speaking |
| C．spoken | D．to speak |