．________a diary every day and you’ll improve your writing．
| A．Keeping | B．To keep | C．Keep | D．If you keep |
Although the novel isn't popular among adults, it __________ the youth, especially boys.
| A．refers to | B．appeals to |
| C．results in | D．deals with |
Jenny was shaking and crying at the corner of the street as if she __________ frightened by somebody.
| A．is | B．has been |
| C．had been | D．would |
A healthy lifestyle is often considered to be __________ exercise, mood and diet, and so on.
| A．associated with | B．associated in |
| C．connected for | D．related at |
Jack wasn't saying anything, but the teacher smiled at him __________ he had done something very clever.
| A．as if | B．in case |
| C．while | D．though |
The experts were doing their experiment in the lab, __________ what happened outside.
| A．didn't know | B．not knew |
| C．not knowing | D．having not known |