Решите ! a: will you stay with us for the weekend ? b: 2.a: did columbus discover america in 1492 1592 ? b: in 1492 , i think , but a: let's hind out . 3.a: viktor speak english and franch , doesn't he ? b: i'm that he does . 4: a: is canada bigger or smaller than the usa ? b: i don't know geography very well .

I think I will
I think but I don't know exactly
I'm sure that he does
I am not sure

1.I will think about your offer(я подумаю над твоим предложением)
2.I am not sure(я не уверен)
3.I think he worked with a repetition...(я думаю он занимался с репетитором..)
4.I think the Canada is bigger than the USA...