Professor Smith, along with his assistants, ______ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
____ is no doubt ____ our class will win the first prize in the final match.
A, It; whether B. There; that C. It; that D. There; whether
Although he knew little about the large amount of work done in the field, he succeeded ________ other more well - informed experimenters failed.
| A．which | B．that | C．what | D．where |
—Is the experiment easy?
— ________ . I’ll just do my bit.
| A．I think so | B．Certainly | C．Not a little | D．Anything but |
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
| A．the; the | B．/;a | C．/; the | D．the; a |
.---Will someone go and get Mr. Black?
---He’s already been ___.
| A．asked for | B．sent for | C．called for | D．looked for |