— I ____ my ID card. I must _____ it.
| A．lost found | B．lost find |
| C．lose found | D．found lose. |
When I was in the USA,I had difficulty ______ English, so I often ask Paul ____ help.
| A．to understand, with | B．understanding, for |
| C．to understand, for | D．understanding, with |
The river is too wide for the swimmers _______________.
| A．to swim | B．to swim in |
| C．to swim across | D．swimming |
I don’t know ______ with this problem. It’s too hard.
| A．which to do | B．when to do |
| C．what to do | D．how to do |
The notebook ___________ be John's ．There is his name on it．
| A．must | B．might |
| C．could | D．can't |
_____you go, ____you do in your school, You must obey the rules．
| A．Wherever; whatever | B．Where; what |
| C．Whatever; wherever | D．What; where |