题目内容

在预制钢筋混凝土箱涵节段的安装中，当设计无具体要求时，成品混凝土强度达到设计强度的（）时，方可搬运、安装。

A. 75%
B. 85%
C. 80%
D. 100%

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涵洞完成后，当涵洞砌体砂浆或混凝土强度达到设计强度的（）%时，方可进行涵洞洞身两侧的回填。

A. 70
B. 75
C. 85
D. 100

When Linda was a child, her mother her to have breakfast in bed.

A. allow
B. allows
C. allowed
D. allowing

He has promised to up tobacco several times.

A. gives
B. give
C. giving
D. gave

A yellow background will make the black lettering out.

A. stand
B. stands
C. standing
D. stood