| 1 | basic course |
| 2 | basketball game |
| 3 | bathing suit |
| 4 | be a mystery to someone |
| 5 | be/feel under the weather |
| 6 | be/run low |
| 7 | be about to |
| 8 | be absent from school |
| 9 | be absorbed in |
| 10 | be accustomed to |
| 11 | be acquainted with |
| 12 | be addicted to |
| 1 | be all in a day's work |
| 2 | be allergic to sth. |
| 3 | be amazed at |
| 4 | be attached to |
| 5 | be backed up |
| 6 | be behind the time |
| 7 | be behind schedule |
| 8 | be better off |
| 9 | be booked up |
| 10 | be bound for |
| 11 | be bound to |
| 12 | be burned up |
