At the age of 14, Father had to leave school and start working. There would be no one to support the family _______ he not worked.
| A．did | B．has | C．had | D．was |
When you ______ the book please return it to the library on time.
| A．get through | B．get along | C．look through | D．look up |
The world is _______ seven continents and four oceans.
| A．made up of | B．made out of | C．made from | D．made in |
It is difficult for you to ______ what will happen in space without gravity.
| A．depend on | B．have some idea of | C．keep from | D．equip with |
Since we have met again after all these years, let's____ each other from now on.
| A．keep up with | B．keep out of | C．keep in touch with | D．keep touching |
She was given the chance to ______ designing the new bridge.
| A．take part in | B．attend | C．go all out | D．join |