Tom is good at his work, but he seems to _____ confidence.
A lack B lack of C lacking in D short of
Jack almost fell off the cliff, but managed to _____ until help came.
| A．keep on | B．catch on | C．count on | D．hang on |
Don't _____ the news to the public until we give you the go-ahead (许可，准许).
| A．release | B．print | C．relieve | D．publish |
His _____of the aeroplane was correct in every detail and could really fly.
| A．shape | B．pattern | C．design | D．model |
The most important _____ of his speech was that we should all work whole-heartedly for the people.
| A．element | B．spot | C．sense | D．point |
. These plastic flowers look so _____ that many people think they are real.
| A．beautiful | B．natural | C．true | D．similar |