As there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.
| A．original | B．alternative | C．convenient | D．staple |
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 |
49. I looked at it and found that including the wine, the bill ______ $70.
| A．arrived at | B．topped at | C．reached to | D．came to |
50. Is there a gas station around _____ I can get some petrol?
| A．which | B．what | C．where | D．That |