There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
It is partly _____ the summer day is longer that everything has a larger time to warm up.
— Look! Here _____. — Oh, yes, here _____.
----_________you or he the teacher of English? ----Neither my sister nor my mother_________present at the meeting.
____ you may be right , I can’t agree completely.
— Why do you want the book so much? — ____, sir.