____ most children nowadays are the only chidren, they tend to be more self-centered．
| A．Ever since | B．Now that | C．Only if | D．Even though |
44. He must be getting thin, for his trousers _____ badly like a flag in the wind.
| A．are flowing | B．flow | C．flowed | D．have flowed |
45. When I met him the other day, it was the first time we _____ each other since we were at school.
| A．saw | B．had seen | C．were seeing | D．have seen |
46. --- When shall we go camping again?
--- You _______ the day. Any day is OK with me.
| A．tell | B．call | C．make | D．Name |
47. Three hundred firemen raced to the hotel after a smoke detector ______ the alarm soon after midnight.
| A．set off | B．set out | C．gave away | D．gave off |
48. Don’t respond to any emails _______ personal information, no matter how official they look.
| A．searching | B．asking | C．requesting | D．Questioning |