All students in the class_______ a loud laugh when the professor told them a joke.
| A．let up | B．let down | C．let off | D．let out |
34. The boy whose name is Justin is nowhere to be found, ______?
| A．is he | B．isn’t he | C．is it | D．isn’t it |
33．— Shall I go and buy more food and drinks for the party?
— No, we have prepared a fridge of those. That ______ be quite enough.
| A．can | B．may | C．might | D．Should |
32．The glass doors have taken the place of the wooden ones at the entrance, ______ in the natural light during the day.
| A．to let | B．letting | C．let | D．having let |
31．— How do you find your new classmates?
— Most of them are kind, but ______ is so good to me as Bruce.
| A．none | B．no one | C．every one | D．some one |
30．______ the news that her son was still alive, tears rolled down the old woman’s face.
| A．Hearing | B．heard | C．Having heard | D．When she heard |