1 . — Peter, you have worked for three hours without a break.
— I need           useful idea for my design, so I’m searching for some information.

A．an

B．a

C．the

D．/

2 . My parents ask me to be ________ honest student today and ________ useful man tomorrow.

A．a; a

B．an; a

C．an; the

D．the; /

3 . I am going to buy __________ useful book. And __________ book is on science.

A．a; the

B．an; a

C．the; a

D．/; the

4 . The boy was surprised to get _________ chance to show his talent.

A．a

B．an

C．the

D．/

5 . —What’s that? Is it a pencil?
—No, it isn’t. It’s ________ pen.

A．a

B．an

C．the

D．/

6 . — Some students seldom have ________ breakfast in the morning.
— It is ________ unhealthy habit. They must change it.

A．/; an

B．/; a

C．the; an

D．the; a

7 . Do you have ________ e-mail address? I want to send you some pictures of the medallists in Olympic Winter Games Beijing 2022.

A．a

B．the

C．an

D．/

8 . —What’s that?
—It’s ________ cup.

9 . —What is this in English?
—________.

A．This is a pen

B．It’s pen

C．It’s a pen

D．It’s the pen

10 . —Excuse me. What’s this in English?
— It’s ________ basketball.

A．a

B．an

C．the

D．/