---Look at the boy running on the playground. Is it David?
---It ______ be him. I saw him go to the teachers’ office just now.
| A．mustn’t | B．can’t | C．couldn’t | D．must |
We traveled all night to London and got there _______ Sunday morning.
| A．in | B．at | C．to | D．on |
Tom and I went boating yesterday. _______ had a good time.
| A．We | B．They | C．She | D．It |
Would you please tell me ______ this book?
| A．where you bought | B．where did you buy |
| C．where you buy | D．where do you buy |
A lot of trees ______ in our school last year.
| A．plant | B．planted | C．are planted | D．were planted |
If she ______ well in her exams, she will go to Beijing University in September.
| A．did | B．does | C．is doing | D．will do |