Along with the letter was his promise ________ he would visit me this coming Christmas.
It isn’t so much whether he works hard; the question is whether he works _____.
___ by the beauty of nature, the girl from London decided to spend another two days on the farm.
The last time I _______ Jack, he _______ football with classmates.
—Did you have trouble with your car this morning? — Yes, but I finally managed _______.
—Growing population resulted in growing rubbish. —There is ______that rubbish will become the major threat to human beings in future.