She took an umbrella with her this morning ________ she should be caught in the rain.[ ]

Of the seven days in a week, Saturday is said to bethe most popular _______ for a wedding in some countries.

You have learned the poem by heart all right, but it doesn’t ____ mean that you have fully understood its meaning

It is the first time that I _______ this kind of moon cake

Helen devoted herself ________to her research and became a top scientist in the field of applied physics[ ]