_________, this math problem seemed quite simple to me, but when I tried to work it out, I just couldn’t.— There are always things like this, I think

It was a great day ,____ we did not enjoy it at the beginning.

y goodness!My laptop must have got stolen—– But where _____ a thief have entered the house with all the doors andwindows still locked

He hardly spent any time on his subjects, _________—_________, so he did badly in his lessons.

It was ______ the second-hand bus that the mechanic spent the whole afternoon in the factor. [ ]