--I called you at half past nine this morning, but there was no answer.
--Oh, sorry, I ______ with my cousin in the supermarket.

I first met Meg two years ago when we _____ at a TV station together.

The police_________the thief at this time the day before yesterday.    

My mother   _     dinner when I came in.         

—I called you at school at half past eight last night,  but nobody answered.              
—Oh,  I _     in my office at that time.            

按要求改写下列句子。
1. Lily watered the flowers this morning.  (用at 6:00 this morning改写)
    Lily _____ _____ the flowers at 6:00 this morning.
2. We should look after the encouraged animals.  (改为同义句)
    We should _____ _____  the encouraged animals.
3. They feed the tigers twice a day.(就画线部分提问)
    _____ _____ do they feed the tigers?
4. We should clean the zoo as often as we can.  (改为被动语态)
    The zoo_____ _____ _____ by us as often as we can.
5. We are for building a primary school in the village.  (改为同义句)
    We _____ _____ build a primary school in the village.

Bill was listening to the radio while Ann ______ TV.      

-Dick gave me a note while I __________ in the library.
-I guess he made it to say "Sorry" to you.

—I called you at six o'clock yesterday evening but there was no reply.
—Oh, I'm sorry. I _______ dinner at my friend's.

He ______ his homework at seven yesterday evening.