在横线上填入合适的介词。

As soon as the baby saw her mother, she burst ________ tears．

在横线上填入合适的介词。

The key ________ success is hard work．

在横线上填入合适的介词。

My interest in collecting stamps dates ________ my schooldays．

在横线上填入合适的介词。

We had our house broken ________ last night．

在横线上填入合适的介词。

The train for Beijing leaves at 7∶00 p. m．You should be at the station ________ 6∶40 p. m at the latest．

在横线上填入合适的介词。

She will stay in her aunt’s ________ the summer holidays．

在横线上填入合适的介词。

I haven’t heard ________ him recently．

在横线上填入合适的介词。

The army walked ________ the river and got safely over．

在横线上填入合适的介词。

He goes to the library every day ________ when he is not well．

在横线上填入合适的介词。

It’s last summer that I met him ________ the first time．