He told me it was the reason _______ he explained just now _______ made him come late yesterday.
A technology company will die soon if it can't __________ to the market fast enough.
We should follow the __________ in a foreign country we are visiting.
__________ our earth, or else it will be no longer fit for us to live on.
Don't __________ a trick on the little girl. She is very shy.
__________ your attention focused on practicing, and you can reach your goal of becoming an excellent pianist.