【题目】I want to be an astronaut in the future so that I can do ________ research in the space station.

【题目】English is difficult _____ my son .

【题目】—Those people know how paper can be________ wood.

【题目】—_____ Gina have a ruler ? — Yes, she _______.

【题目】Water came into the ship，and soon，it went down to the ________of the river.

【题目】—Let’s play volleyball . —________.

【题目】— You look very cool today, Simon.

【题目】—What color _______those shoes?

【题目】How ________Jack is！He hasn't fed the dog for two days.

【题目】This novel is really ________ useful book for me，because it has given me a lot of courage to overcome difficulties.