21. I asked _______have a break.
A. if we could B. could we C. whether could we D. if could we
22. Allen had to call a taxi because the box was _______ to carry all the way home.
A. much too heavy B. too much heavy C. heavy too much D. too heavy much
23. Someone called me up in the middle of night, but he hung up _______ I could answer the phone.
A. as B. since C. until D. before
