男性，61岁，有胃溃疡史8年。近来中上腹有饱胀感，大便隐血试验多次呈阳性，有贫血体征。该患者可能发生了

A．出血
B．穿孔
C．癌变
D．幽门梗阻
E．胃动力障碍

按括号内的要求句型转换。(每空一词)

1. He does exercise three to six times a week. (对划线部分提问)

    _____ _____ _____ he _____ exercise?

2. Amy always goes home by bus. (改为同义句)

    Amy always _____ a bus home.

3. The scarf is made of silk (对划线部分提问)

    _____ is the scarf _____ _____?

4. There are some bananas on the table. (改为否定句)

    There _____ _____ bananas on the table.