He was thinking about the problem when an apple fell off the tree, _______ him right on the head.
| A．hit | B．having hit | C．hitting | D．and hitting |
Before our study we did not have data that could tell us __ those changes were small or large .
| A．that | B．how | C．when | D．whether |
Generally speaking , almost all the kids are ______about how everything around them works.
| A．curious | B．careful |
| C．anxious | D．excited |
Our government’s plan to fight against air pollution will focus on _____ information and handling PM2.5.
| A．expressing | B．representing |
| C．gathering | D．acknowledging |
Each time I ________ a good essay when reading newspaper , I cut it out and keep it.
| A．work out | B．come across |
| C．care about | D．put down |
A harmonious society is very important , so all the laws must be strictly _________.
| A．watched | B．observed |
| C．carried | D．handled |