In aerospace devices the weight of the necessary power producing equipment is _____.
| A．vital | B．possible | C．capable | D．reliable |
It is well known that good relationship between two countries_____ the development of mutual culture and economy.
| A．result from | B．arise from | C．contributes to | D．leads to |
Jack is late again. It is _____ of him to keep others waiting.
| A．normal | B．typical | C．common | D．ordinary |
_____ the flight to New York will be delayed is ____ I'm especially worried about.
| A．If; what | B．Whether; that | C．When; that | D．Whether; what |
Michael Jordan, known as ____ top scorer in _____ NBA, did much charity work for society.
| A．a; a | B．the; the | C．A; / | D．/; the |
---I hear Johnson was badly injured in the accident. ---_____, let's go and see him.
| A．If so | B．Whenever possible | C．If any | D．What's more |