Your question _____ he didn’t inform you earlier has not yet been answered, _____
has aroused our curiosity.
| A．which; which | B．why; it |
| C．that; it | D．why; which |
I have no doubt in my mind______ they will be glad to see me.
| A．if | B．whether | C．that | D．about |
With the help of high technology, many new substances（物质）______in the past years.
| A．discovered | B．have discovered | C．had been discovered | D．have been discovered |
---- Will Joe attend the party? ----- If his wife won’t go to the party,_________.
| A．he will either | B．neither does he | C．he neither will | D．neither will he |
----- Can I go back home now? ----- You______ to leave until you ______ your work.
| A．won’t allow; finish | B．won’t be allowed; will finish |
| C．won’t be allowed; have finished | D．won’t allow; will finish |
----- Are you used to______ in the north with the old couples?
----- Yes, I am glad to find out that coal is used______ electricity for home use.
| A．live; to produce | B．living; to produce | C．to live; produce | D．living; producing |