In difficult times， there are always national heroes_____step up and bring people hope．（ ）
| A． |
whom |
B． |
which |
C． |
who |
There aren't any libraries in our town，are there？
No，but it is said one_____next year．（ ）
A．will be builtB．is built
C．will build
I called you yesterday evening．But nobody answered．
Oh，sorry．Maybe I____in the bathroom at that time．（ ）
A．take a showerB．took a shower
C．was taking a shower
Miss Li，could you please help me____this math problem？
OK．Let me try．（ ）
A．look upB．work outC．set up
Must I wait here all morning？I have a lot of work to do．
No，you____．You may be back in the afternoon．（ ）
A．mustn'tB．can't
C．don't have to
Grandma is rather deaf，so you must speak clearly and___to her．（ ）
A．quietlyB．loudlyC．noisily