We all know that ________ walking on the moon is very difficult．

one

the

/

a

________ learning(Learning)English is very interesting to me．

/

The

A

An

She studies ________ medicine before she turned ________ writer．

/;/

the; a

/; a

the;/

His uncle gave him books to read, but after a page or two he would put ________ book down and pick up ________ new one．

the;/

a; a

a; the

the; a

A non-smoker can hardly imagine ________ pleasure of having ________ smoke after a meat．

/; a

a; a

the; a

/;/

They have their reasons for keeping their marriage ________ secret for ________ moment．

the; a

the; the

a; the

a; a

He had decided to give it up, but on ________ second thoughts he decided to try ________ third time．

the; a

/;/

a; a

/; a

As is known to all, ________ tiger is in ________ danger of dying out．

a; a

the;/

a;/

the; the

________ British people always talk about ________ weather．

The; the

/;/

/; the

The;/

There’s more than forty ________ in the hospital, some of ________ are from nurses．

woman doctors; them

women doctors; them

woman doctors; whom

women doctors; whom