It is clear that no use can be made ______radium _____we don’t know clearly the characteristics of it.
A.from; if | B.of; unless | C.from; unless | D.of; if |
—Have you finished the book?
—No. I’ve read up to _____ the children discover the secret cave.
A.which | B.what | C.that | D.where |
It never occurred to me _____ you could succeed in persuading him to change his mind.
A.which | B.what | C.that | D.if |
To improve the quality of our products, we asked for suggestions had used the products.
A.whoever | B.who | C.whichever | D.which |
________ is of no concern to us.
A.It rain or not | B.If or not it rains |
C.Whether it rains or not | D.Will it rain or not |
____is no doubt ____ Bob can win the first price in the match.
A.There; that | B.It; that | C.There; whether | D.It; whether |