I think the planes .... very low to avoid radar signals.

The police couldn't ..... done more to uncover the mystery behind this tragedy.

She ...... a lot to get there! You need to work hard to be successful.

Kennedy's family must ..... a lot of pain.

Nixon might have ...... under a lot of pressure!

Of course John isn't here today. He spent the whole night dancing. He ___ be at home with a serious foot ache.

You ___ possibly be tired. You've just woken up.

Your mother ___ be a great cook. You are always so keen to get back home to eat!

I don't know why I am so tired these days. I ___ be working too hard. Or maybe I am not sleeping too well.

Do you know where Carl is? He ___ be out - his car keys are on the table.

You seem to know everything about the theatre. You ___ go every week.

Oh, the phone is ringing. Answer it. It ___ be Kate. She always rings at this time.