Listen! I think it____ be Mr． White singing in the office．
No， it ___ be him． He left for London just now．（ ）
| A． |
must； mustn't |
B． |
may； mustn't |
| C． |
must； can't |
D． |
can； can |
Our country now has____ high﹣speed rail network in the world．（ ）
A．longB．longer
C．longestD．the longest
Yancheng is the only city____ China to be named after salt．（ ）
A．atB．onC．inD．with
Tom became interested in books at a very young age． He read every book he could find and bought books of all kinds． Today Tom has a big collection of books． His favourite books are mystery novels and books about detective stories．
The story mainly tells us ．（ ）
A．why Tom does the reading
B．how Tom learned to read
C．how much Tom likes to read
D．what Tom's favourite books are
Are you sure you won't come for a drink with us？
， if you insist．（ ）
A．Not at allB．All right then
C．It dependsD．I don't care
It's an either﹣or situation﹣we can buy a camera this year or we can go on holiday but we can't do ．（ ）
A．otherB．eitherC．allD．both