99.The chairman thought___________necessary to invite Professor Smith to speak at the meeting .
| A．that | B．it | C．this | D．Him |
Sunset at Mount Huangshan is a beautiful scene, _______ I’ll never forget.
| A．one | B．it | C．what | D．that |
Mike is handsome, kind and full of energy. , I can’t speak too highly of him.
| A．As a result | B．By the way | C．In a word | D．On the contrary |
Teachers’ advice of ______ stress over the school days must be granted by the headmaster.
| A．students to reduce | B．students reducing |
| C．students reduced | D．students being reduced |
The public transportation in this city is very convenient, where many buses run ______.
| A．occasionally | B．approximately | C．immed iately |
D．frequently |
. —Where have you been all day?
—I _______ some former classmates and I couldn’t get back until it was dark.
| A．have met | B．would meet | C．met | D．had met |