The lead singer was ill and couldn’t sing that night, and her __________ didn’t perform well, which made the audience disappointed.
| A．latitude | B．substitute |
| C．institute | D．altitude |
We found ______ very difficult for the children to understand what the chairman said at the meeting.
| A．that | B．its | C．this | D．it |
．________ useful book is helpful to ________ artist.
| A．An, an | B．A, a | C．A; an | D．An; a |
Sometimes the best and most beautiful things in this world ________．but can be felt with the heart．
| A．can see | B．cannot see | C．can be seen | D．cannot be seen |
—Please tell me ________ for the meeting yesterday．
—Sorry．The traffic was bad．
| A．why you came late | B．why did you come late |
| C．when you came late | D．when did you come late |
．We should give a hand to the people ________ need help．
| A．who | B．whose | C．whom | D．when |