Everyone has periods in their lives ________ everything seems very hard．

when

where

which

that

By the time we reach that page, we ________ twenty lessons of the book．

will study

will have studied

would study

have studied

On hearing the bad news, he got up quickly ________ the lunch unfinished．

leaving

left

to leave

leave

The girl looked at me with a ________ expression．Maybe the problem was quite ________．

puzzled; puzzling

puzzling; puzzled

puzzled; puzzled

puzzling; puzzling

Would you please ________ your statement again? I don’t understand what you were saying．

classify

clear

clarify

charity

Dr．Black is a professor of chemistry．________, he is a famous writer．

In all

In brief

In fact

In addition

The new invention may ________ a lot of changes in our daily life．

result from

expose to

lead in

contribute to

I have bought two ball pens, ________ writes well．

none of them

neither of them

neither of which

none of which

It was only when I reread his poem recently ________ to appreciate its beauty．

that I began

did I begin

I began

until I began

I often read China Daily, ________ of great help to my English study．

which I think is

which I think it is

that I think is

I think is