It 
us thirty minutes to climb to the top .
| A．make | B．carried | C．took | D．made |
was in front of you last Monday ?
| A．Who | B．What | C．When | D．Where |
Chinese people invented paper for 
.
| A．we | B．us | C．our | D．I |
Nine children
their grandparents last week .
| A．visits | B．visit | C．visiting | D．visited |
The man sits
under the tree .
| A．at | B．up | C．down | D．in |