21. We shouldn’t have set out at that time .We had the fact that it was getting darker.
A. missed B. ignored C. disagreed D. swapped
22. There was ______ time _____ Chinese used foreign oil.
A. a; when B. a; while C. /; when D. /; while
23. catch the first bus, he got up very early this morning.
A. So as to B. So that C. In order to D. In order that
