Fill the correct prepositon in blank 1-i have not seen him ... he was 16 2-it's been raining ... 4 o'clock 3-my mom was cooking ... we came in 4-... someday, we'll travel to the Moon 5-the boy's played game ... early morning 6-it's 3 years ... he started learning English 7-he's been working ... Laos ... 2010 Nhanh giúp mình với, không cần giải thích đâu

1. I have not seen him since he was 16.
(CT thì hiện tại hoàn thành với since: S + have/has (+ not) + PII + since + một mốc thời gian)

2. It's been raining since 4 o'clock.
(CT thì hiện tại hoàn thành tiếp diễn với since: S + have/has + been + V(ing) + since + một mốc thời gian)

3. My mom was cooking when we came in.
(CT thì quá khứ tiếp diễn: S + was/were + V(ing) + when + S + V(ed/d) + ...)

4. In someday, we'll travel to the Moon.
(CT thì tương lai đơn: S + will + V(inf) + ...)

5. The boy's played game since early morning.
(CT thì hiện tại hoàn thành với since: S + have/has (+ not) + PII + since + một mốc thời gian)

6. It's 3 years since he started learning English.
(CT với start: It's + một khoảng thời gian + since + S + start(ed) + V(ing) + ...)

7. He's been working in Lao since 2010.
(CT thì hiện tại hoàn thành tiếp diễn với since: S + have/has + been + V(ing) + since + một mốc thời gian)