---Alice, you look puzzled, Have you understood it?---Yes．I ____

---Alice, you look puzzled, Have you understood it?---Yes．I _____another problem just now．

#101644

l have thought of

am thinking of

had thought of

was thinking of

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---You look very tired. ---Well, __________my lessons all the afternoon.

#100167

I have reviewed my lessons

I have been reviewing

I reviewed

I had reviewed

I’m glad to see that you ________ a lot of progress since I ________ you last.

#104786

will make; have met

have been making; met

had made; met

have made; meeting

—The constant noise around here______ me crazy!—Calm down.It’s no use complaining.

#99823

drove

drives

is driving

had driven

 I wish I ____ clever enough to work out the ____ geometry problem.

#102986

can be; abstract

could be; abstract

can be; easy

could be; easy

 I know Mr. Brown; we ______ to each other at an international conference.

#104101

are introduced

are been introduced

were introduced

had been introduced

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