单选题  Laura spoke very slowly to ______ what she would say.

单选题  Doing household chores can teach children how to ______ themselves.

单选题  —How was your camping in the countryside last weekend?
—It was great. We ______ a tent by the lake and had much fun.

单选题  It is very important to ______ a constant temperature inside the greenhouse.

单选题  Tom, you ______ look down upon others because of their appearances.

单选题  Mary is a clever girl. She ______ read poems when she was 5.

单选题  With the final exam ______, students have to study hard.

单选题  So far, the chairman has not ______ on the report I submitted to him.