用所给的动词的适当形式填空。

1. My mother often ________ (watch) TV after supper.

2. I'd like ________ (go) to school by bike.

3. Mary enjoys                (listen) to the music at night.

4.               he usually                (finish) doing his homework before 9:00?

5. Tom,               (open) the door, please.

6. Mary and I               (be) good friends.

7. There ________ (be) a lot of children in the supermarket.

8. Let's ________ (go) home together.

9. He wants ________ (play) in the next World Cup.

10. Ann goes                (shop) at the weekend.

某热水采暖系统流量为32t/h时锅炉产热量为0.7MW，锅炉回水温度为65℃，热网供回水温降分别为1.6℃和0.6℃，在室温为18℃时，钢制柱形散热器的K₂值与95/70℃时的K₁值相比约为下列哪一项（）。[钢柱式散热器K=2.489Δt^0.8069W/（m²·K）

A．0.9

B．0.89

C．0.88

D．0.87