The research lacks evidence,and therefore,its conclusions are doubtful.
.. It is a good city for cycling because it is flat and ________is convenient for bikes.
.He made the choice to give all his money away, ______, he said, brought him happiness.
.This is the best restaurant in our town. I’m afraid you can’t find _______ here.
.Can you see the tree _____ we tied our boat last time?
.---- Ricky, why hasn’t Billy been with us these days?---- Oh, he is _________for next month’s 400m race.