________ is very important in doing any scientific work.
| A．Album | B．Category | C．Accuracy | D．Assume |
weigh
| A．laugh | B．frighten | C．tough | D．enough |
special
| A．musician | B．African | C．magic | D．Pacific |
touch
| A．doubt | B．wound | C．famous | D．rough |
I don't want _______like I' m speaking ill of anybody, but the manager's plan is unfair.
| A．to sound | B．to be sounded |
| C．sounding | D．to have sounded |
He tried his best to solve the problem, _______difficult it was.
A. however B. no matter
C. whateverD although