It was January the_________he came here last time.
| A．thirty-one that | B．thirty first that |
| C．thirtieth-one when | D．thirty first when |
When I entered the room, I found Mary ______ at the desk ______ her homework.
| A．sat; doing | B．sitting; to do |
| C．seating; to do | D．seated; doing |
Yesterday we visited a modern hospital, around _________ some fruit shops.
| A．which is | B．that is | C．which are | D．it are |
— You’re at ______ liberty to say whatever you like.
— I think you’re taking ______ risk by investing everything in one company.
| A．the; / | B．the; a | C．/; / | D．/; a |
_________ your composition carefully, some spelling mistakes can be avoided.
| A．Having checked | B．Check | C．If you check | D．To check |
It was very wise of you to ______ well trained workers______ untrained ones in today’s society.
| A．substitute; for | B．in place; of | C．replace; by | D．substitute; with |