Our physics teacher told us light __________ fasterthan sound last term.

His ability is never in doubt—-the question is _______he is prepared to work hard.

ThelocalgovernmentinShenzhenhasrecentlypassedanewregulationforbiddingsupermarketsandstoresto _____freeplasticbagstoshoppers, inabidtoprotecttheenvironment. [ ]

What about _____ a rest—Let’s go for a walk.

I regret _____ more time with my grandmabefore she passed away.