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 |
I asked him to come at 8 o’clock, but he _________. It’s already 9 now.
| A．didn’t show up | B．hasn’t shown |
| C．hadn’t shown | D．wasn’t showing up |
It being Sunday, rather than _________ at home, I preferred ________.
| A．stay; to travel | B．to stay; to travel | C．to stay; traveling | D．stay; travel |
Low-carbon lifestyle is of great benefit to the world environment. However, ________ can be enjoyed from it until you have a deep understanding of it.
| A．something | B．nothing | C．few | D．much |
Julia was very sad over the loss of the photos she had shot at Canada, _________ this was a memory she especially treasured.
| A．as | B．if | C．because of | D．where |
My mother ________ always wave goodbye to me while I was leaving for school.
| A．should | B．must | C．could | D．would |