There was ______ time _____ Chinese used foreign oil.
| A．a; when | B．a; while | C．/; when | D．/; while |
It’s very wise of you to ________ well trained workers _____ untrained ones in the
assembly line.
| A．substitute; for | B．substitute; with | C．replace; with | D．instead; by |
He was badly injured and couldn’t _______ the game.
| A．attend | B．join | C．participate | D．take part in |
. Such women _____ know Tom thought he was charming.
| A．that | B．which | C．/ | D．as |
. After he retired from the office, Tom _______ painting for a while, but soon lost interest.
| A．took up | B．saved up | C．kept up | D．drew up |
Earth is a rocky planet _______ liquid water, which is necessary for life, can exist.
| A．as | B．which | C．where | D．when |