Câu 6. MUST and MUST NOT

a. At an intersection, you ... slow down. You ... go fast.

b.  Here, you ... turn left. You ... turn right. You ... go straight on.

c. Here, you ... stop. You ... go straight on.

Trả lời:

a. At an intersection, you must slow down. You must not go fast.

b. Here, you must turn left. You must not turn right. You must not go straight on.

c. Here, you must stop. You must not go straight on.