The food safety is a serious ____ in many countries． People should try to solve it．（ ）
| A． |
subject |
B． |
program |
C． |
problem |
D． |
opinion |
We ________ carry forward the spirit of serving the people whole﹣heartedly.（ ）
A．mightB．shouldC．could
On July 1st，we'll celebrate the ________ birthday of the CPC.（ ）
A．hundredthB．hundredC．hundreds
—Could you please tell me_________？
—Next Thursday morning.（ ）
A．when we visited the Capital Museum
B．when did we visit the Capital Museum
C．when we will visit the Capital Museum
D．when will we visit the Capital Museum
Today，many winter Olympic sports__________ even by children.（ ）
A．enjoyedB．enjoy
C．were enjoyedD．are enjoyed
Mr.Smith______ Chinese for two years.He's much better at it now.（ ）
A．learnsB．was learning
C．has learnedD．will learn