All the students in my class can’t ______ the math problem. It’s too difficult for us.
A. work on B. work out C. work for
_____will you stay in America? About two weeks.
A.How many B. How often C. How long
I don’t know _____ he will come tomorrow, ______he comes, I’ll tell you.
A.if…whether
B. whether…whether
C. whether..if
I’m ___ in any _____book.
A. interested…interesting
B. interesting…interested
C. interests…interest
____ the boy was walking down the street, the UFO landed.
A.While B.After C. Before
In China ,many families are _____ to buy cars these days.
A.enough rich B. rich enough C. very rich