---You may find the key to the maths problem on page 107.
---Ah, it’s so simple. I wonder why I ________ of that.
| A．didn’t think | B．haven’t thought | C．wasn’t thinking | D．hadn’t thought |
Jane, quickly get this film, I want to know if this camera works well.
| A．washed | B．developed | C．printed | D．shown |
A famous professor is coming to give us a lecture. Will you it?
participate B. attend C. enter D. deliver
The traffic rule says young children under the age of four and ____ less than 40 pounds must be in a child safety seat.
| A．being weighed | B．to weigh | C．weighed | D．weighing |
Many buildings in the city need repairing, but the one ______first is the library.
| A．repaired | B．being repaired | C．repairing | D．to be repaired |
The news shocked the public, _______to great concern about students’ safety at school.
| A．having led | B．led | C．leading | D．to lead |