_____ of water makes Death Valley a desert, but it is by no means devoid.
| A．Lacking | B．Being lack |
| C．Because of lack | D．Lack |
-- Alison, I’m sorry. I can’t come to the wedding with you tomorrow morning. -- ________?
-- My grandma was severely ill, so I have to stay in the hospital to look after her.
| A．How is it | B．How come | C．So what | D．What’s the problem |
Double ovens are a good idea, especially ________ you are cooking several meals at a time.
| A．though | B．if | C．that | D．unless |
I know a little bit about the city as I __________ there for one year in my youth.
| A．am studying | B．had studied | C．studied | D．have studied |
Leaves are found _______ all kinds of trees, but they differ greatly ________ size and shape.
| A．in; on | B．in; from | C．on; by | D．on; in |
To save class time, our teacher has ________ students do half of the exercises in class and complete the other half for our homework.
| A．we | B．us | C．our | D．ours |