___what they have achieved in the past five years, we still have a long way to go.
Can you tell the___difference between the words”require”and “request”?I sometimes get puzzled by their meanings
“Perhaps we need to send for Dr.Smith to see what we can do about it,”Father suggested___to his neighbor who had come to discuss the problem
The research lacks ___evidence,and therefore,its conclusions are doubtful
We used to see each other___,but I haven’t heard from him since last year
Bicycling is good exercise;___,it does not pollute the air