The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.
| A．in danger | B．in control | C．in order | D．in progress |
They made no effort to hide their amusement ________ I produced a packet of sweets from my pocket.
| A．however | B．whatever | C．whichever | D．whenever |
________ you stepped into the lab with your shoes on? You’re supposed to take them off before you enter it. I told you so!
| A．How come | B．How dare | C．How about | D．How long |
The number of the people present at the concert ________ much smaller than expected. There ________ many tickets left.
| A．was; was | B．were; was | C．were; were | D．was; were |
It was not until I got home ________ I found my wallet missing.
| A．that | B．when | C．where | D．which |
Comrade Wang ________ be in Shanghai—I saw him in the company only a few minutes ago.
| A．mustn’t | B．can’t | C．may not | D．isn’t able to |