.At the beginning of class, the noise of desks ____ could be heard outside the classroom.
| A．opened and closed | B．to be opened and closed |
| C．being opened and closed | D．to open and close |
With everything arranged properly, the project is surely to _________ smoothly as planned, step by step.
| A．improve | B．increase | C．progress | D．occur |
Through the open window we saw on the floor the happy father lying ________ his stomach, his daughter riding excitedly on his back.
| A．on | B．with | C．above | D．from |
Usually the teachers will be busy ________ the test papers after an examination.
| A．grading | B．naming | C．ranking | D．grouping |
Below the topsoil of the earth is the subsoil, _____ layer that contains stones mixed with a small amount of _____ organic matter.
| A．a; the | B．the; the | C．不填; 不填 | D．a; 不填 |
I would appreciate _____if you could help me get a ticket in the Peak Transport in the Spring Festival Season.
| A．you | B．that | C．this | D．it |