21. —What did you think of _____ president?
—I didn’t care for him at first, but after ______ time I got to like him.
| A．the, a | B．/, the | C．the, the | D．/, a |
________ global energy safety, all the countries have been called on to take joint efforts ．
| A．Having ensured | B．Ensuring |
| C．To ensure | D．To have ensured |
It is _____ you deal with difficulties that shows _____ you are really like．
| A．what; what | B．how; that | C．which; how | D．how; what |
At the crossing there is an arrow _______the direction to the Andrew Farm． 
| A． | indicating | B． | to indicate | C． | indicated | D． | dictating |
By the time the police arrived on the scene, the burglars_______．
|
| A．fled | B．had fled | C．has fled | D．was fleeing |
I had only ______ slight temperature, but my mother regarded the illness as serious enough for ______ hospital treatment．
| A．the; a | B．a; the | C．/; a | D．a; / |