A family of five is really a heavy burden, so we all have to work hard to________.
| A．find out | B．work out | C．help out | D．carry out |
_______ being Sunday, the library was closed.
| A．That | B．It is | C．It | D．This |
Was it _______ that they saw?
| A．she | B．that she | C．her | D．herself |
________ is no difference between them.
| A．There | B．Where | C．It | D．What |
_______ is no good _______ without doing anything.
| A．This, talking | B．It, to talk | C．It, talking | D．That, to talk |
________needs further discussion whether we’ll build a library or not.
| A．We | B．He | C．It | D．The thing |