Excuse me! Is this ____ new house？
Yes， it's ____．The parents of them bought it last September．（ ）
| A． |
Lucy and Lily's； theirs |
| B． |
Lucy's and Lily's； them |
| C． |
Lucy's and Lily's； theirs |
| D． |
Lucy and Lily's； them |
__________ the help of modern technology， scientists got a photo of a black hole．（ ）
A．AtB．InC．OnD．With
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