Bikes are ____ in our city.
A. more popular and more popular B. most popular and popular
C. more popular and most popular D. more and more popular
They wonder ________ robots will make humans lose their jobs or not.
A. that B. if C. whether D. so
_____ he is very young, _____ he knows a lot about science.
A. Because, so B. Though, but
C. When, and D. Although, /
They find ________difficult to understand the teacher when she talks.
A. it B. that C. this D. its
__What’s the matter? —I’m having trouble_____ who has taken my book.
A. looking after B. looking for C. looking up D. looking out
You can improve your English________ reading more.
A. in B. with C. of D. by
