1.wh_n,  wh_le,  h_avily,  l_ok out,  b_g,  

d_orbell,  st_rt,  t_wn,  w_y,  ch_t,  h_ve a chat,  

w_it for,  t_ke a picture,  dr_p,  l_ckily,  br_ak,  

sudd_nly,  h_ar,  f_otstep,  f_llow,  sc_red,  inspe_tor,  

myst_ry,  di_mond,  an_wer,  answ_r the qu_stion,  a_swer me,  

answer the ph_ne,  ann_yed,  l_ud,  understa_d,  emp_y,  j_wel,  

br_celet,  p_arl,  ev_l,  th_ef,  serv_nt,  b_g.

2.

When:

When the alarm clock began to ring, I was sleeping.

When the car crash happened, my dad was watching TV.

When I met my brother, I hugged him.

When it began to snow heavily, I was listening to music in my room.

When we looked out of the window, it was raining heavily.

While:

While I was blowing the balloon, the doorbell rang.

While we were having dinner, Matt started to talk.

While I was chasing after my sister, the cell phone began to ring.

While sister was laughing at me, I was having a lesson.

While I was working in the garden, I saw a big bug.

3.

Past simple:

I walked home after the party last night.

Kate watched TV a lot last summer vacation.

4.

Past continuous:

I was walking home when I met him.

Kate was watching TV when we arrived.

Past simple and Past continuous:

I saw(see) Sue in town yesterday, but she didn’t see(not see) me. She was looking(look) the other way.

I met(meet) Tom and Jane at the airport a few weeks ago. They were going(go) to Paris and I was going(go) to Rome. We had(have) a chat while we were waiting(wait) for our flight.

I didn’t see Mike for years. When I last saw(see) him, he was trying(try) to find a job.

How fast were you driving (you/drive) when the car crash happened(happen)?

Sam took(take) a picture of me while I wasn’t looking(not/look).

Last night I dropped(drop) a plate while I was doing(do) the dishes. Luckily it didn’t break(not break).

I was walking(walk) along the street when suddenly I heard(hear) footsteps behind me. Somebody was following(follow) me. I was scared and I started(start) to run.

5.例句:

The inspector was asking the woman some questions.

It is a mystery to me why they went to that old house.

Her husband gave her a diamond ring as her birthday gift.

I was annoyed with my little brother.

She is annoyed because her friend didn’t come to see her.

The music is too loud, please turn it off.

I don’t understand what is my teacher saying?

Please empty your hands and mouth before class.

She keeps all her jewel in a safe.

Look! Such a beautiful bracelet on her wrist

I bought a pearl necklace for my mom.

Hurting animals is such an evil thing. 

The policeman is chasing after the thief.

The servant did housework while I was working.

She begged him not to go.