33. There's no light on - they______ be at home.
| A．can't | B．mustn't | C．needn't | D．shouldn't |
.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．immediately | 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 |