Do you know _____ he is?—He says “1.75 metres”, but I’m not sure.[ ]

Jack, could you help me when the plane will take off on the Internet? —I’m sorry, my computer doesn’t work.

If ________, please pay a visit to me and have a further discussion of the issue.

I know the man ______ the green bike.[ ]

Don’t worry. There is ________ time left.