I don’t know if Mr. Smith ____. If he ___, I will tell you.
| A．comes, will come | B．will come, come |
| C．will come, comes | D．will come, will come |
What is your mother doing， Linda？
She ___________dinner in the kitchen now．（ ）
A．is cookingB．was cooking
C．cookD．cooking
__________ 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