—What about _____ English-Chinese dictionary on the bookshelf?
—In my opinion, it’s _____ useful tool book for my English learning.
| A．a; an | B．an; a | C．the; a | D．the; an |
You can ______ information through Apps on your mobile phone. It’s convenient.
A. end up B. look up C. dress up
The top students believe being careful is the ______ to good scores on their exams.
A. secret B. form C.process
It’s reported that Tu Youyou won the Nobel Prize. We ______ her.
A. are surprised at
B. are known for
C. are proud of
The book Expo(书博会) ______ in September this year. It encouraged people to read.
A. is held B. was held C. will be held
---______ can we warn people not to swim here?
---By putting up signs.
A. How B. Why C. Where