The kind teacher devoted all her time she had ___________ her students.

People have always been ________ about exactly how life on earth began.[ ]

usually cool in April in Chongqing,but it sometimes ______ be rather hot for a few days

My grandpa transplants some trees to his garden ________ it is the best time for them every year.

Not until I began to work ____ how much timeI had wasted.