In this experiment, the famous professor showed three different ________ to the study of physics.(2012·河北保定中学月考)
________ the right kind of training,these teenage soccer players may one day grow the international stars.
Please do me a favor—________ my friend Mr.Smith to Youth Theater at 7:30 tonight.
Nowadays people sometimes separate their waste to make it easier for it ________.
At the age of 29,Dave was a worker,________ in a small apartment near Boston and ________ what to do about his future.
When he ________ the door,he found his keys were nowhere.