1. We ___________ some experiments at the moment. A. are doing B. are going C. are getting D. are playing 2. __________is a letter to America? It is 30,000 dong. A. How far B. How much C. How long D. How many 3. I have English ___________ on Wednesday and Thursday. A. a class B. classes C. subjects D. a subject 4. I like Math best. It’s my ___________ subject. A. interesting B. favorite C. important D. difficult 5. The most ___________ after-school activities are baseball, football and basketball. A. popular B. unpopular C. famous D. useful 6. Schools in the USA are a little different ___________ schools in Viet Nam A. at B. with C. from D. for 7. ________is it from Ho Chi Minh City to Ha Noi? It is about 1,726 km A.How long B. How far C. How often D. How many nhanh nha mn