Will you stay here for dinner with us？
Sorry， I ____________． My mother is waiting for me at home．（ ）
A．mustn'tB．can'tC．needn'tD．couldn't
What do you think of working as a doctor？
It 's a good job to help people keep___________．（ ）
A．busyB．strictC．healthyD．generous
Betty has a beautiful _________． She wants to be a singer in the future．（ ）
A．voiceB．lookC．noiseD．sound
Oh． my God! I forgot to bring my pen here．
Don't worry． I have two． You can use __________．（ ）
A．IB．meC．myselfD．mine
To save time， many students have _________ lunch at school every day．（ ）
A．aB．anC．/D．the