He has to join the festival in order to play Vietnamese folk games.

A. Do you mind helping me to put the chair away?

B. Would you like to help me to put the chair away?

C. How about helping me to put the chair away?

D. Do you like to help me to put the chair away?

A. If there was no Covid-19 pandemic, we will have to cancel the trip to the mountain.

B. If there is no Covid-19 pandemic, we would not have to cancel the trip to the mountain.

C. If there were no Covid-19 pandemic, we would not have to cancel the trip to the mountain.

D. If there were no Covid-19 pandemic, we will not have to cancel the trip to the mountain.

A. English vocabulary should be learnt through reading.

B. English vocabulary have to be learn through reading.

C. English vocabulary should be learning through reading.

D. English vocabulary had to learnt through reading.

A. I have recently seen him.

B. I haven't seen him for ten years.

C. The last time I saw him was last year,

D. I am going to meet him in ten years' time.

A. Tom asked Mark what time he came home every day.

B. Tom asked Mark what time he come home every day.

C. Tom asked Mark what time did he come home every day.

D. Tom said to Mark what time does he come home every day.

A. After he turned off all the devices to save electricity, he left there.

B. He left the room without turning off all the devices to save electricity.

C. He left the room although he did not turn off all the devices to save electricity.

D. Because he was in the right room, he turned off all the devices to save electricity.

A. This pencil is used to draw thick lines.

B. This pencil is used to drawing thick lines.

C. Thick lines used to be drawn with this pencil.

D. Thick times are used to being drawn by this pencil.