— Why does the lake smell terrible?— Because large quantities of water _________.[ ]

Grandma will appreciate ____ if her elder sister couldcome back from abroad.

The little boy goes on a ropeway ______ the river to school.

y, it’s raining outside. Shall I give you aride— Thanks. ______.

If I ＿＿you . I＿＿study harder.