The text is too difficult. The explanation of our teacher will help make it easy ________.
| A．to understand | B．to be understood |
| C．understood | D．understanding |
We tried to _________his doubts and let him tell the truth.
| A．replace | B．remove | C．review | D．rebuild |
The police ________him to see if he had a gun.
| A．searched | B．searched for | C．in search of | D．looked for |
Is this museum _______some German friends visited the day before yesterday?
| A．which | B．that | C．where | D．the one |
The visitors saw rows of houses the roofs _______are red.
| A．where | B．that | C．what | D．of which |
As is known to all, China _______the group of developing countries.
| A．belonging to | B．was belonged to | C．belongs to | D．is belonged to |