He must have been working really hard these days. This morning, I even noticed ______ behind his ears.
| A．grey hair | B．grey hairs | C．the grey hair | D．much grey hair |
Everyone will go through life's stages of ups and downs, ________ selfrespect plays a key role in the maturity(成熟) of a person.
| A．when | B．which | C．as | D．that |
Here is a list of names of the guests to be invited to the party. Please don’t _______ any of them when typing.
| A．let out | B．make out | C．leave out | D．put out |
We can hardly believe that an intelligent person like Daniel ________ be asking such a silly question.
| A．should | B．might | C．must | D．could |
I have to reschedule the appointment with you since there is a ________ in my plan.
| A．contact | B．contrast | C．connection | D．conflict |
The long-lasting war, filled with blood and deaths, ended in people’s sadness, ______ no result.
| A．having produced | B．to produce | C．producing | D．produced |