As a new graduate, he doesn’t know _______ it takes to start a new business.
| A．how | B．what | C．when | D．which |
Many years of hard work_______ his great success in the development of this new type of material.
| A．due to | B．thanks to | C．contributed to | D．looked into |
Danby left word _______he would call again in the afternoon .
| A．who | B．that | C．as | D．which |
I was surprised by his words ,which made me recognized ______silly mistakes I had made .
| A．what | B．that | C．how | D．which |
_______was last night ______I read about the history of English.
| A．This ,when | B．It ,since | C．It .that | D．It ,before |
Thousands of foreigners were______ to the Shanghai World Expo the day it opened.
| A．attended | B．attained | C．attracted | D．attached |