52The struggle against sand storm will not end _____ victory unless we pay much attention to the balance of nature

Again and again the doctor_______ the crying baby girl,but he couldn’t find out what was wrong with her.

The girl looks so beautiful. Is she a model ora film star —_____________. She’s a nurse.

We’d better invite Tom and Kate to the party tonight.- Yes, ＿＿＿＿＿＿ I’ll give them a call right now.

________the help of the teacher, the student who wasn’t good at math________the difficult problem quickly.[ ]