Mom, when shall we go to Dongying Museum this weekend– Oh, sorry. I’m going to Beijing for a meeting. ___Saturday __ Sunday is OK.

Checking your answers before handing in your paper can help you __________ mistakes.

Many chemical substances react________oxygen

Millie is better than Jack ______drawing pictures, but she has some problems ______ English

San Diego’s Zoo and Sea World are places where residents and visitors alike can enjoy r animals and plants in shows and exhibits, ___ in part by San Diego’s climate.