It is worth considering what makes“convenience” foods so popular， and
better ones of your own.
| A．introduces | B．to introduce | C．introducing | D．introduced |
—How long did you do your homework? —______.
| A．Before it struck 10 | B．Since supper time |
| C．So long as I stayed up | D．Until 10 o’clock |
My mother bought me a new pair of boots on my birthday _____she had promised.
| A．which | B．what | C．with | D．as |
. We liked the oil painting better ___ we looked at it.
| A．as | B．while | C．the moment | D．the more |
Through English we will be able to communicate_____ part of the world we come from.
| A．in which | B．even if | C．whatever | D．wherever |
. This photo of mine was taken ______ stood the famous high tower.
| A．which | B．in which | C．where | D．there |