68. Mind you. Don’t bump your head on the low________when you go upstairs for sleep.
| A．top | B．tip | C．bottom | D．Ceiling |
When________，the wholesale vegetable market will be the largest one in China.
| A．completing | B．completed |
| C．being completed | D．to be completed |
Jack has had no ________experience of this kind of job，but he got the job offer just due to his honesty.
| A．previous | B．obvious | C．cautious | D．precious |
________in a traffic jam yesterday morning，Jack did not arrive at his office on time.
| A．Catching | B．Caught | C．To catch | D．To be caught |
Sam managed to keep in________contact with his family while he was working in New Zealand.
| A．pleasant | B．confident | C．constant | D．different |
The boy is always found______in reading books.
| A．to bury | B．burying | C．buried | D．buries |