I find __________ very difficult to learn English well .
A．that B．this C．one D．it
The math problem is too difficult ,I can’t__________ .
A．work out it B．work it out
C．work them out D．put it out
On National Day there are more than five __________ people in the zoo.
A．thousand B．thousands
C．thousands of D．thousand of
Tina used to __________a round face.
A．is B．have C．be D．has
There ’s __________“u” and __________“s” in __________ word “use”.
A．an , a, the B．a, an ,/
C．a, a, a D．a ,an, the
—What’s this?
—It’s ________orange.
A．a B．an C．the D．不填
