.They were all so tired that they could ______.
| A．do nothing but sleep | B．do anything but sleep |
| C．do nothing but to sleep | D．do anything but to sleep |
His wife _____ to Singapore a few times, and now she ____there for a meeting.
| A．has been…has been | B．has been…has gone |
| C．has gone...has gone | D．has gone… has been |
---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 |
It's Sunday morning. We_______ get up early as usual.
| A．haven't to | B．hasn't to |
| C．don't have to | D．mustn't |
---I don't like the music because I can't sing along with it. ---Me, _______.
| A．either | B．too |
| C．also | D．but |
--- Mum, have you seen my mobile phone?
--- _________you bought last week? I’m sorry I haven’t seen _________.
| A．One; it | B．The one; it |
| C．One; one | D．The one; one |