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smile at it, it will smile back. ? A. When B. Before ? C. Until D. After ? ( ) little boy could work out the problem, ________ it’s quite difficult. ? A. but B. so ? C. unless D. though A D ? ( )5.—Mike, please turn down the Dabao ________ Erbao are sleeping. ? —Sorry, I’ll do it right away. ? A. Neither。 nor B. Either。 or ? C. Both。 and D. Not only。 but also ? ( )6.(2022宜昌 )—It has been much easier for me to go to work________ shared bikes appeared. ? —But they also caused plenty of problems. ? A. since B. before ? C. unless D. though C A ? ( )7.—What happened to that dog? ? —It didn’t leave his sick ownes ________ someone came to save him. ? A. since B. while ? C. for D. until ? ( ) will achieve our China Dream ________we work hard and never give up. ? A. and B. so ? C. if D. but D C