In summer people usually stay up late outside, ______ the cool air.
We’ll never give up _______ they may do or say .
No matter how hard he worked, ___ ____
I’ll start early , _______I oversleep.
_______ you begin the work , you must carry it out through to the end.
I’ll start early , _______ it is dark or light .A. however C. whether C. if D. though