They can ___________ (ride) their bikes The girl ___________ (have) a nice blanket

They can ___________ (ride) their bikes The girl ___________ (have) a nice blanket
They can ___________ (ride) their bikes The girl ___________ (have) a nice blanket

They can ___________ (ride) their bikes The girl ___________ (have) a nice blanket
They can __ride_________ (ride) their bikes The girl ___has________ (have) a nice blanket

They can ride their bikes.
因为 can 是情态动词，所以后面的动词用原形。
The girl has a nice blanket.
因为主语是第三人称单数。

找出能替换画线部分的选项，划线部分是rides bike by 的话要用by bike（单数，不加a） on的话要加a或复数形式，即：on a bike或on bikes

ride
has

第一个填ride，they是复数，所以不用加s，而且can是modal verb（情态动词）所以要用动词原形。第二个填has，因为girl是第三人称单数，所以要用第三人称单数形式has