Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
A．when B．before
C．in case D．until
Everybody needs calcium, but it is quite possible for a similar person to be totally healthy by eating only________.
A．as half much B．as much half
C．half as much as D．half as much
________ the famous actress wants to offer to her fans is honesty and happiness.
A．Which B．What
C．That D．Whom
—We________gas.I'm afraid we can't go much further.
—I know there's a gas station ahead.Sure it will last us until we get there.
A．are running out B．have run out
C．are running out of D．have run out of
Sara enjoys amusing her friends by________stories.
A．keeping up B．making up
C．putting up D．taking up
Not until my first book was put on the top 10 list________ writing could really make a difference in my life.
A．I knew B．that I knew
C．did I know D．that did I know
