13. Don’t play by the river _______ you fall in and drown!
| A．in case | B．so that | C．in order that | D．when |
______ part that women _______ in society is great.
| A．The; play | B．A; take | C．A; play | D．The; take |
You are really very kind. I’ll never forget the____you have done to me.
| A．favour | B．deed | C．help | D．good |
A computer is so useful a machine ________ we can use everywhere.
| A．that | B．which | C．as | D．what |
— Why didn’t you come to Mike’s birthday party yesterday?
— Well, I ____, but I forgot it.
| A．should | B．must | C．should have | D．must have |
Mike, as far as I know, _______ like to play music.
| A．seems | B．appears | C．feels | D．does |