( ) My mother ___________ a new dress yesterday. A. buy B. buys C. bought
＋＋＝________ A．seven B．eight
－－＝________ A．three B．two
＋＝________ A．eleven B．ten
＋＝________ A．four B．six
×4＝________ A．six B．eight
＋
＋
＝________
－
－
＝________
＋
＝________
＋
＝________
×4＝________
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