Running a company is not _____ a matter of hiring people – they also need to be trained [ ]

do you know so much about the UFO—I usually get the information by surfing the Internet.

I feel tired and sleepy. –Why not stop for a while

It’s too late to go to the basketball match now, ____, it’s beginning to rain

What do you think of the music teacher?—________ she is an elegant lady, she can be extremely difficult to work with.[ ]