单项选择题
The sailors do cleaning and repair work （）the bosun.
A. under the supervision of B. with the help of C. in charge of D. in the charge of
单项选择题 The bosun is satisfied （）your work.
单项选择题 Sometimes, it is necessary for （）to mix the paint.
单项选择题 Remember that gloomy, damp and rainy days are not suitable for （）.
