．It is obvious to the students ______ they should get well prepared for their future.
| A．as | B．which | C．whether | D．that |
A few days after the interview，I received a letter ________me the job.
| A．offered | B．offering |
| C．to be offering | D．having offered |
________ themselves awake they sat on the floor and told each other stories.
| A．Keep | B．Keeping |
| C．To keep | D．To have kept |
A railway station is no place for a child ________ alone at night.
| A．leave | B．leaving |
| C．to be leaving | D．to be left |
With much work ________unsettled，the newlyselected president will have a hard time.
| A．remaining | B．remained | C．remains | D．to remain |
He was sitting on the floor ________ by books.
| A．surrounded | B．surrounding |
| C．surroundings | D．surround |