A pencil has teeth marks on it. A: The person who used the pencil was nervous. B: The pencil was chewed up by a toddler or pet. C: Someone or something chewed the pencil. D: The pencil belongs to someone who is trying to quit smoking.
A pencil has teeth marks on it. A: The person who used the pencil was nervous. B: The pencil was chewed up by a toddler or pet. C: Someone or something chewed the pencil. D: The pencil belongs to someone who is trying to quit smoking.
—Whose is this pencil? —It's ________（I）.
—Whose is this pencil? —It's ________（I）.
This pencil is___ than that one.
This pencil is___ than that one.
A country produces only pencils and erasers. Pencil production is allocatively efficient if the marginal ________ of a pencil equals the marginal ________ of ________. A: cost; benefit; an eraser B: cost; cost; an eraser C: benefit; benefit; an eraser D: benefit; cost; a pencil
A country produces only pencils and erasers. Pencil production is allocatively efficient if the marginal ________ of a pencil equals the marginal ________ of ________. A: cost; benefit; an eraser B: cost; cost; an eraser C: benefit; benefit; an eraser D: benefit; cost; a pencil
She took out a pencil and ______ of it.
She took out a pencil and ______ of it.
There________ an eraser in the pencil box. A: is B: are
There________ an eraser in the pencil box. A: is B: are
2. –Whose pencil is this ?—It’s_________( I ).
2. –Whose pencil is this ?—It’s_________( I ).
There ______ a pen, two books and a pencil case on the desk.
There ______ a pen, two books and a pencil case on the desk.
When a pencil is partly in a glass of water, it looks as if it _____.
When a pencil is partly in a glass of water, it looks as if it _____.
Is that your pencil shar．pener?（作否定回答）
Is that your pencil shar．pener?（作否定回答）