he has been working so hard . __________ he could answer such a difficult question.
| A．No wander | B．No wonder | C．why | D．because |
Probability is the mathematical study of the _____ of an event's occurrence.
| A．desire | B．likelihood | C．result | D．effect |
As soon as the children were _____, their mother got them out of bed and into the bathroom.
| A．woke | B．waken | C．wake | D．awake |
I hope my teacher will take my recent illness into _____ when judging my examination.
| A．regard | B．account | C．thought | D．observation |
The child enjoyed _____ up the wooden bricks then knocking them down.
| A．adding | B．pushing | C．piling | D．forming |
The illness from which Mary is suffering has now been _____ as hepatitis (肝炎).
| A．diagnosed | B．determined | C．deduced | D．discovered |