helpful advice you you gave us on protecting personal information the other day！
A. What B. What a
C. What an D. How
We all believe you will succeed in working out the problem you give up.
A. if B. because
C. since D. unless
People throughout the world together now to protect the natural environment.
A. are working B. worked
C. will work D. have worked
A： have you talked with your friends on Wechat？
B：Since I came back from the post office.
A. How far B. How often
C. How soon D. How long
Air pollution is becoming than ever before, so many families prefer to buy electric cars。
A. serious B. more serious
C. more seriously D. the most seriously
The manager’s voice sounded on the phone. He offered to show us around the company.
A. softly B. friendly
C. gently D. seriously
