Many countries are using natural gas , wind and other forms of ________ .
Lao She’s _______ are still popular. Lots of readers read them today.
I got out of the car, went ______ a gate and walked along a path.
---We haven’t seen Tim these days. ---He _______ America. A has gone to B has been to C is going to D will go to
---Would you like to see Pirates of the Caribbean at the cinema? I’ve heard it’s great. --- Yes, I’d like to. But I _____ it twice. A have seen B saw C will see D am going to see
---I’ve heard some scientists have sent a spacecraft to Mars. ---Really? Has it arrived _____? A already B yet C still D ever