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
Some researchers believe that there is no doubt ____ a cure for AIDS will be found.
A．which B．that C．what D．whether
Don't panic; just ______ the rock and I'll come and fetch you down.
A．keep up with B．put up with C．make up for D．hold on to
