Have you heard of this new computer brand, Mike—Yes, of course and I’ve decided to buy _____.

The changes in our chemistry lab will cost quite a lot, ____ they will save us money in the long run

I ________you yesterday afternoon，but you ________at home.

Someone called me up in the middle of the night,but they hung up ________I could answer the phone.

Could you tell me_______ yesterday—-Because my bike was broken on my way here.