—What do you want ________those old boxes?
—To put things in when I move to the new flat.
| A．by | B．for | C．of | D．with |
_____ is the population of your country?
| A．How | B．what | C．How many | D．How many |
Please say "Hi" to Bob ______ me.
| A．to | B．for | C．about | D．from |
After we walked ______ the forest, and ______ a river, we arrived at that small village.
| A．across; across | B．through; across |
| C．across; through | D．through; through |
We were about to leave the classroom _____ it began to rain.
| A．while | B．when | C．as | D．before |
Three students in ten will go and _____ to stay in the classroom.
| A．the rest are | B．the rest is | C．the other are | D．the other is |