________ Chai Jing said in her video about the smog has caused public concern.
| A．That | B．Which | C．How | D．What |
Such a grammar mistake is __________ among the beginners of English study.
| A．normal | B．common |
| C．general | D．ordinary |
A person's __________ body temperature is about 37℃.
| A．ordinary | B．normal |
| C．common | D．usual |
The program, __________ at improving the students' ability of listening and speaking, will surely be a success.
| A．to aim | B．aimed |
| C．to aiming | D．having aimed |
He didn't answer, with his gun __________ at David.
| A．aims | B．to aim |
| C．aiming | D．being aimed |
Teachers are now aware of the difficulty that some students have __________ attention.
| A．paid | B．to pay | C．paying | D．pay |