. Explosion happened in Wisconsin early Monday，_______ two visitors．
| A．killed | B．killing | C．to kill | D．having killed |
— How long is it ______ you picked up your badminton training?
— It was not until my finance became better in last December ______ I started the training.
| A．before; when | B．until; that | C．that; when | D．since; that |
The young teacher found it hard to _____ his explanation in class to most of the class.
| A．go through | B．pull through | C．come across | D．get across |
—Tom, your lazy bone! You left the dishes unwashed again!
—_______? Mom isn’t at home and she can’t hear you.
| A．Why | B．So what | C．For what | D．How come |
The driver was at _____ loss when ______ word came that he was forbidden to drive for speeding.
| A．/;the | B．a; the | C．/; / | D．a; / |
One of the most important things in education is to let students ____ positive emotions and experience in the process of their learning.
| A．require | B．acquire | C．demand | D．clarify |