The problem ________ this material can be used in our factory has been solved.
| A．that | B．what | C．whether | D．why |
When she came in, she found a stranger ______ at the back of the classroom with his eyes ______ upon her.
| A．sitting; fixing | B．sat; fixing | C．seating; fixed | D．seated; fixed |
If you live in the country or have ever visited there, ______ are that you have heard birds singing to welcome the new day.
| A．situations | B．facts | C．chances | D．possibilities |
______ when we passed by its nest.
| A．Up into the blue sky did the bird fly | B．Up into the blue sky flew the bird |
| C．Up into the blue sky the bird flew | D．Flew up into the blue sky the bird |
“Sorry” is the hardest word to say sometimes. _______ you know you’ve done something wrong, or something inappropriate, it takes courage to say sorry.
| A．Only if | B．Even if | C．If only | D．As if |
______ for the breakdown of the school computer network, Alice was in low spirits.
| A．Blaming | B．Blamed | C．To blame | D．To be blamed |