________ the jewels were locked in a strong box，the thieves stole them without any difficulty

No matter what you say of him, I still think much of him, or else I _____ him to do that.[ ]

All the guests at the party were dancing and singing happily _____ the electricity was cut off.

May and susan are twins and I can’t tell_____is_____.

has become the host of the 2020 Olympic Games, which is the biggest sporting on the planet.