﹣﹣ Do remember to watch out for cars while crossing the street．
﹣﹣ ________．（ ）
| A． |
Heard it |
B． |
Made it |
C． |
Forgot it |
D． |
Got it |
Roy works in London． It ________ him about half an hour to get to work by bus every day． （ ）
A．costsB．spendsC．takes
Around the world， 300 million tons of plastic ________ each year， of which about 10 percent ends up in the sea． （ ）
A．is createdB．was created
C．creates
"Left﹣ behind" children _______ see their parents， because their parents work in the cities leaving them behind in the countryside to be cared for by their grandparents． （ ）
A．alwaysB．hardly ever
C．often
Ants are pretty small． You might think that they _______ be rather weak． But what you might not know is that ants are actually very strong for their size． （ ）
A．needB．can'tC．must
Tennis can exercise all of our muscles （肌肉）． And it requires ________ to spend time with others． This is good for our health too． （ ）
A．oursB．usC．we