Small _____ it is, the pen is a most useful tool.

A. because          B. so                  C. if                  D. as

When you read the book, you' d better make a mark _____ you have any questions.

A. at which        B. at where            C. the place             D. where

 He is so strongly built that he looks _______ he could lift an elephant.

A. if               B. as if            C. like           D. that

It is often said that an American starts a speech with a joke , _______ a Japanese has an apology to make.

A. which               B. what               C. while       D. that

Smith has made _______ that we are all surprised .

A. such much progress                      B. so fine a progress

C. such a great progress as                D. so much progress

_____ has already been pointed out, grammar is not a set of dead rules.

A. As　　　             B. It　　　           C. That　           D. Which

I was given three books on cooking, the first _____ I really enjoyed.

A. of that           B. of which            C. that            D. which

Mary has two brothers, ________ are doctors.

A. both of they   B. both of whom        C. both of them      D. whom of both

He studied hard and later became a well-known writer, ____ his father expected.

A. that was what                            B. what was that      

C. and which was                            D. which was what

In the dark street, there wasn’t a single person ____ she could turn for help.

A. whom               B. who                C. to whom         D. form whom