__________ with the size of the whole earth, the highest mountain does not seem high at all.
| A．When compared | B．Compare |
| C．While comparing | D．Comparing |
I__________ you somewhere before, but your name has escaped me_________.
| A．must see;for a moment | B．must have seen; for a moment |
| C．must see;for the moment | D．must have seen; for the moment |
What worried the child most was _________ to visit his mother in the hospital.
| A．his not allowing | B．his not being allowed |
| C．his being not allowed | D．having not been allowed |
—When__________ and visit our exhibition next month?
— When_______, I will let you know.
| A．will he come; he will come |
| B．will he come; he comes |
| C．does he come; he will come |
| D．does he come; he comes |
Michael __________ here to see you and he____________ a note on your desk.
| A．has come; had left |
| B．has been; has left |
| C．has come; left |
| D．has been; left |
--How long ___________ each other before they__________ married?
--For about a year.
| A．have they known;get |
| B．did they know; were going to get |
| C．do they know;are going to get |
| D．had they known; got |