1 . I tried to learn how to play it, but after trying for hours, I ______ that I could never make a musical sound with this instrument!

A．was convinced

B．was convincing

C．convinced

D．convincing

2 . As she turned around, there ______ Gladys Claffern.

A．stands

B．stood

C．is standing

D．was standing

3 . —Why didn't you buy any bread while doing shopping yesterday evening?
—Sorry, ______________.

A．I forget

B．I forgot

C．I had forgotten

D．I have forgotten

4 . His teacher told him that since his parents were working abroad, either his grandparents or one of his uncles ______ allowed to come to the parents’ meeting .

A．was

B．were

C．are

D．is

5 . Not until the woman was out of work again two months ago ____ going to attend a training class.

A．had she considered	B．did she consider
C．she considered	D．she had considered