---Why didn't you go to the party last night?
---Because I was waiting for Sam in his office _______ he came back.
| A．for | B．until |
| C．since | D．from |
Who ________ the man and the woman?
| A．am | B．is | C．are | D．be |
Her mother works at __________ hospital. She is a doctor.
| A．/ | B．the | C．an | D．one |
Tom’s ________ are both factory workers.
| A．parents | B．father | C．mother | D．family |
I can ride ________ bike but I can’t ride __________ horse.
| A．the; / | B．the; a | C．/; / | D．a; a |
They __________ after school.
| A．play the basketball | B．play table tennis |
| C．play piano | D．play the football |