The new classroom will be constructed this year, and a firm from Korea have been chosen to______the work.
| A．assign | B．provide | C．undertake | D．settle |
Having finished the work，__________．
| A．it was almost six o’clock |
| B．supper was ready |
| C．a postman came and delivered some letters． |
| D．we had a rest and then had supper |
It was with great joy _______ Tom received the news that his lost son had been found．
| A．because | B．which |
| C．since | D．that |
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 |
Look out！Don’t get too close to the house ________ roof is under repair．
| A．which | B．whose | C．what | D．that |
I have an appointment _______ Dr．Brown，but I need to change it．
| A．to | B．off | C．with | D．from |